石坂産業株式会社

What 石坂産業株式会社 does

Ishizaka Inc. is a privately-held Japanese industrial waste intermediate treatment company founded in 1967 and headquartered in Saitama Prefecture, with current Representative Director and President Noriko Ishizaka. The group operates an all-weather recycling plant that combines proprietary mechanical sorting, AI-assisted image recognition, and manual sorting to achieve a 98% reduction/recycling rate, processing approximately 239,657 tons of waste in FY2024. Its proprietary product portfolio includes NS-10 recycled embankment material — recipient of Japan's first construction-technology certification in 2015 — plus Ecomore Chip, TOILETOWA compost, and the CY Series launched in March 2026.

The business model combines industrial-waste treatment fees, sales of recycled materials into construction and consumer channels, transportation services, and an unusually broad community-facing layer that draws roughly 60,000 visitors per year to a 170,000 m² restored satoyama site, alongside retail collaborations with brands such as SHIRO and the KUMIKI PROJECT. Customers span construction and demolition contractors, industrial manufacturers, retail/consumer brands, municipalities, and educational institutions. Revenue is not publicly disclosed; no IPO or external funding activity is reported.

Recent strategic activity is concentrated in 2024-2026: the company secured the first-ever Advanced Recycling Business Designation in Japan (April 2026), formed a metal-recycling JV with NIPPON DENSETSU KOGYO (July 2026), partnered with Toyota Boshoku to upcycle construction-waste plastics into automotive parts (March 2026), opened a solar panel recycling facility (June 2025), and signed international expansion MOUs with Idea Studio Nepal (April 2024) and the Lahti Region of Finland (2023). The legal entity is scheduled to rebrand as Ishizaka Gumi Inc. effective January 2027.

Name

石坂産業株式会社

Legal name

石坂産業株式会社

Website

https://ishizaka-group.co.jp

Company type

Private

Founded year

1967

Operating status

Operating

Headcount range

1–10 employees

Short description

Ishizaka Inc. is a privately-held Japanese industrial waste intermediate treatment company founded in 1967, operating an all-weather recycling plant in Saitama that processes ~240,000 tons annually with a 98% recycling rate, serving construction, manufacturing, retail, and municipal clients across Japan.

Ownership category

akta.pro rank

Product category

Waste Management and Resource Recycling Services

NAICS

Waste Treatment and Disposal (5622), Hazardous Waste Treatment and Disposal (562211), Waste Collection (56211), Administrative and Support and Waste Management and Remediation Services (56)

SIC

Refuse Systems (4953), Hazardous Waste Management (4955), Sanitary Services (4950)

akta.pro primary industry

Subtitle: Waste Treatment & Disposal — Sub-industries (L4) (EUAIACAA)

akta.pro secondary industries

Hazardous Waste Management (Collection/Treatment/Disposal) (IMAIAFAI), Industrial Packaging Waste Services (Pallets, Cardboard, Film, IBCs/Drums—Non-hazardous) (EUAIAGAD), Manufacturing Process Residuals (Non-hazardous Sludges, Fines, Filter Cake) (EUAIAGAH)

Keywords

• Industrial waste processing
• Resource recycling services
• Construction waste management
• Recycled construction materials
• Environmental education programs

Headquarters

HQ city

Miyoshi-machi (三芳町), Iruma-gun

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

Offering type

Services

Cost components

Operations, Personnel, Technology or R&D, Infrastructure, Supply Chain, Marketing or Sales

Revenue model

1. Industrial Waste Intermediate Treatment Services: 石坂産業 intermediates industrial waste processing for seven waste categories (paper, wood, glass/concrete/ceramic, rubble, metal scrap, plastic, textile/tatami). Customers — primarily construction companies, demolition firms, and manufacturers — contract with the company to process waste, reducing volume and recovering recyclable resources. Revenue is generated through treatment fees per delivery or contract. The company achieved a 98% reduction and recycling rate, processing 239,657 t in FY2024.
2. Recycled Material Sales: 石坂産業 transforms processed industrial waste into recycled construction materials (e.g., NS-10 embankment material, RC40-0 and RC10-0 recycled concrete products, Ecomore Chip wood chips, gravel, tile, and brick chips) and sells these to construction firms, retail brands, and end consumers. Products are sold directly through the sales department and used in applications ranging from road subgrade to retail store fixtures.
3. Environmental Education and Factory Tours: 石坂産業 operates facility tours and training programs throughout the year for adults, families, companies, and schools. Programs are customized by theme, budget, and duration, covering waste treatment processes, satoyama conservation, and sustainability education. These tours serve both as a community engagement activity and a revenue-generating service.
4. In-House Collection and Transportation Services: 石坂産業 provides transportation of industrial waste from generation sites to its treatment facilities using a fleet including 2-ton dump trucks, 3-ton container trucks, 4-ton flatbed and crane trucks, large-capacity packer trucks, and 10-ton flatbed dump trucks and container trucks.

Go-to-market motion1 record

Distribution channels5 records

Marketing channels5 records

Core offering

Ishizaka Inc. operates an all-weather industrial waste intermediate treatment plant in Miyoshi-machi, Saitama Prefecture, that processes seven categories of industrial waste (paper, wood, glass/concrete/ceramic, rubble, metal scrap, plastic, and textile) through proprietary mechanical and manual sorting, achieving a 98% reduction and recycling rate. The company also sells recycled construction materials (such as NS-10 embankment material and Ecomore Chip wood chips), runs environmental education and factory-tour programs, and operates the Santome Konjakumura satoyama restoration site and Ishizaka Organic Farm under its 'Zero Waste Design' vision.

Product overview

Ishizaka Inc. operates as a comprehensive waste management and resource circulation company under its 'Zero Waste Design' vision. The core offering is industrial waste intermediate treatment achieving industry-leading 98% reduction and recycling rates, supported by proprietary sorting technologies including AI-powered sorting robots. The company offers a portfolio of recycled products including NS-10 embankment materials, Ecomore Wood Chips, TOILETOWA circular bio-toilets, and the new CY Series made with Rematerials. Environmental education services include satoyama restoration (Santome Konjakumura), organic farming (Ishizaka Organic Farm), and hands-on factory tours. The company also operates specialized facilities including a Solar Panel Resource Recovery Facility and provides digital services through its Members Site customer portal.

Differentiator

Problem solved

Functional benefit

Brands

• 三富今昔村 (Santome Konjakumura): A satoyama environmental education field and public space where the restored natural environment is open for visitors to experience nature and environmental education programs.
• 石坂オーガニックファーム (Ishizaka Organic Farm)
• CY（サイ）シリーズ
• NS-10
• エコモアチップ (Ecomore Chip)

Products and services

• Industrial Waste Intermediate Treatment (産業廃棄物中間処理) Comprehensive industrial waste processing service using proprietary equipment design and manual sorting to achieve a 98% waste reduction and recycling rate. Processes seven types of industrial waste: paper, wood, glass/concrete/ceramic, rubble, metal scraps, plastic, and textile/tatami waste. Customers include construction companies, demolition firms, and manufacturers.
• Resource Regeneration / Recycled Materials (資源再生) Transforms processed industrial waste into recycled construction materials (NS-10 embankment material, RC40-0 and RC10-0 recycled concrete products, Ecomore Chip wood chips, gravel, and tile/brick chips) sold to construction firms, retail brands, and end consumers for road subgrade, backfill, store fixtures, and landscaping.
• NS-10 Recycled Embankment Material Embankment material made from recycled soil extracted from construction mixed waste. Co-developed with IS Engineering Co., Ltd.; received Japan's first construction technology certification for a waste-derived embankment material in 2015. Used in road subgrade, backfill, and store fixtures.
• Ecomore Chip (エコモアチップ) Wood recycling product with all corners removed through proprietary technology, making it safe to handle and step on. Used as high-quality bedding for livestock, gardening, and landscaping applications including weed prevention and water absorption.
• TOILETOWA Fully Circular Bio-Toilet (完全循環型バイオトイレ) Fully circular bio-toilet that completely recycles all waste on-site, achieving complete circular resource flow. Constructed in 2023 using NS-10 as exterior wall material. Won Bronze Prize and Sustainable Space Award at Japan Space Design Awards 2024.
• CY Series Circular Products (CYシリーズ) Circular products made with 'Rematerials' — recycled materials from industrial waste processing. Launched March 2026 as part of the company's advanced recycling model under Designation No. 0001.
• Santome Konjakumura Satoyama Environmental Education Site (三富今昔村) Satoyama environmental education field where degraded forestland has been restored to traditional countryside. Serves as a hands-on learning venue for environmental education programs, nature experiences, community events, and certified Nature Coexistence Site activities. Operates an online shop (shop.santome-community.com) for local and agricultural products.
• Ishizaka Organic Farm (石坂オーガニックファーム) Self-operated farm using traditional regional circular farming methods to regenerate biodiversity-rich soil. Holds GLOBALG.A.P., ASIA GAP, and Organic JAS certifications. A wholly owned subsidiary of Ishizaka Inc.
• Environmental Education Programs and Factory Tours (環境教育) Educational programs for sustainability awareness including factory tours for adults, family tours, and corporate programs. Offers customized courses based on theme, budget, and time requirements (e.g., Course A full-day satoyama experience with dinner, Course B talks plus tour).
• Members Site Customer Portal (メンバーズサイト) Customer portal for waste delivery management allowing registered enterprise users to view delivery history, contract details, make delivery reservations, and handle inquiries in one place.
• Solar Panel Resource Recovery Facility Facility accepting waste solar panels for resource recovery treatment, located in Iruma City, Saitama Prefecture. Began operations June 2, 2025, accepting waste plastics, metal scrap, and glass/concrete/ceramic waste from solar panels.

Quantifiable outcome

• 98% reduction and recycling rate (industry-leading)
• +5 more outcomes

Named customers2 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

AI capability2 records

Feature6 records

Partnerships

15 partnerships are on record, tiered core and minor.

• NIPPON DENSETSU KOGYO CO., LTD. (日本電設工業株式会社)coreStrategic or Co-development Partner · 1 July 2026Established NDK-ISHIZAKA METAL CO., LTD. (NI Metal), a joint venture for metal recycling business. Ownership: NIPPON DENSETSU KOGYO 60%, Ishizaka Inc. 40%. Capital: JPY 50 million. Operations scheduled to commence in 2028. The venture aims to build a new resource circulation model in the electrical equipment construction sector by properly collecting and recycling scrap materials including waste electric wires, cables, ferrous and non-ferrous metals.
• Waseda University School of Human Sciences (早稲田大学人間科学学術院)coreStrategic or Co-development Partner · 20 May 2026Comprehensive Cooperation Agreement signed May 15, 2026 covering educational activities, research activities, and international academic and cultural exchange. Ishizaka provides satoyama and plant facilities as practical training grounds; Waseda contributes academic expertise for joint research on nature symbiosis sites, biodiversity, and sustainable society formation. Seven collaboration areas including environmental conservation, community development, health and well-being, and human resource development.
• Toyota Boshoku Corporation (トヨタ紡織株式会社)coreStrategic or Co-development Partner · 27 March 2026Following joint implementation of METI's FY2025 demonstration project, signed an agreement to promote the application of construction waste plastic in automotive parts. Building on Ishizaka's precision sorting and Toyota Boshoku's automotive manufacturing expertise, the partnership aims to establish high-quality recycled plastic supply chains for automotive components under a Circular Manufacturing (arterial-venous industry) framework.
• Miyoshi Town, Saitama Prefecture (埼玉県三芳町)coreOthers · 16 February 2026Comprehensive Cooperation Agreement (連携協力に関する包括協定) renewed in 2026. Also includes a new MOU on handling disaster waste in the event of large-scale earthquakes or other major disasters. Partnership covers regional revitalization, community development, environmental education, and human resource development. Miyoshi Town is the municipality where Ishizaka's headquarters and main plant are located.
• Hitachi Construction Machinery Co., Ltd. (日立建機株式会社)minorStrategic or Co-development Partner · 16 December 2025Hitachi Construction Machinery conducted a demonstration experiment of battery-powered excavators at Ishizaka's facility (announced December 2025). This collaboration supports decarbonization of heavy machinery operations at the recycling plant.
• Organic Civil Engineering Association (有机土木協会)coreStrategic or Co-development Partner · 6 December 2024Collaboration to supply recycled materials (gravel, concrete, tile, wood chips) from Ishizaka's processing operations as construction materials for organic civil engineering projects. The partnership targets 'Regenerative Infrastructure' — infrastructure built in harmony with nature's self-regulating functions. Currently supplying recycled materials for the Nasu Town Plaza (Nasumachizukuri Hiroba) project in Tochigi Prefecture, where recycled gravel and tile are used for water infiltration and soil environment improvement.
• Idea Studio Nepal (ISN)coreStrategic or Co-development Partner · 10 April 2024MOU signed for the construction of a 'Zero Waste Design Waste Recycling Plant' in Kathmandu, Nepal. Ishizaka's first overseas expansion of its circular model. Joint venture planned for 2025. Six highly skilled Nepali engineers from Tribhuvan University will join Ishizaka in May 2025 under the Experts Exchange Program (EEP) to learn recycling technologies. The project addresses Nepal's severe waste management crisis and employment instability.
• Ministry of the Environment of Japan / Saitama PrefecturecoreOthers · 18 March 2024Santome Konjakumura certified as a 'Nature Coexistence Site' by the Ministry of the Environment. Also recognized by Saitama Prefecture as the designated manager of Saitama Midori-no-mori Nature Park (from January 2026).
• IS Engineering Co., Ltd. (アイエスエンジニアリング株式会社)coreStrategic or Co-development Partner · 1 March 2024Co-developed NS-10 recycled embankment material. IS Engineering contributed to the construction technology certification (2015) of NS-10 as Japan's first waste-derived embankment material. Continued joint R&D has produced the TOILETOWA bio-toilet and other innovative circular products.
• Lahti Region, FinlandcoreStrategic or Co-development Partner · 28 November 2023MOU signed for cooperation toward a circular economy with the Lahti Region, Finland. Lahti was designated as the European Green Capital in 2021, and this partnership facilitates knowledge exchange, joint initiatives, and best practice sharing in circular economy between the two regions.
• Tokyu Construction Co., Ltd. (東急建設株式会社)minorStrategic or Co-development Partner · 7 January 2021Joint development and trial introduction of an AI-powered waste sorting robot ('Waste Sorting Robot') for automated separation of construction waste. The robot was designed to be compatible with existing intermediate treatment plants and was piloted at Ishizaka's facility.
• NEC CorporationcoreTechnology or Integration · 14 July 2020Collaboration announced July 2020 for smart plant realization using local 5G as the central axis of cross-industry partnerships to promote digitalization of resource recycling and SDGs. A three-company collaboration with Intel Corporation also started in 2020. Demonstrated local 5G and AI-enabled waste sorting at Ishizaka's plant (January 2023). The partnership aims to address labor shortages through AI and IT-based automation in the waste processing industry.
• Intel CorporationcoreTechnology or Integration · 14 July 2020Participated in the three-company collaboration (with NEC) started in 2020 for smart plant realization, contributing technology expertise for local 5G and AI applications in resource recycling operations.
• Japan CleanTech Industry Consortium (JCTIC) Members (B.Grove Inc., Musashi Seimitsu Industry Co., Ltd., ABEJA Co., Ltd., Mitsubishi UFJ Research and Consulting Co., Ltd.)coreStrategic or Co-development Partner · 21 August 2018Ishizaka is a member of JCTIC, established with the goal of introducing AI technology and developing solutions to solve social problems. Key themes: (1) building recycling/recycling technologies, (2) regional agriculture and food circulation, and (3) establishing an industrial economic model within regions. JCTIC was announced at the 3rd Asia Local Councilors Forum Japan Conference (2018) with Prime Minister Abe in attendance.
• Children's Museum of the Arts (CMA), New YorkminorStrategic or Co-development Partner · 25 March 2016CMA, which welcomes 150,000 visitors annually, collaborates with Santome Konjakumura to simultaneously host art experience programs. Children create artwork at Santome Konjakumura, photos are shared online, and exchanges are conducted with children and artists in New York. This partnership supports Ishizaka's ESD (Education for Sustainable Development) initiatives through cross-cultural art experiences.

Scale indicators10 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Hitachi Zosen Corporation: Large Japanese industrial plant manufacturer and operator, including waste-to-energy and recycling plant construction. Comparable as a supplier of waste treatment technology infrastructure to Japanese municipalities and industrial operators, though broader in scope and scale.
• Stericycle, Inc. U.S.-focused regulated waste and compliance services company with strong position in hazardous and specialized waste streams. Comparable in advanced waste processing, regulatory compliance services, and ESG-driven customer offerings, though primarily North American and medical waste oriented.
• Veolia Environnement S.A. Global environmental services leader offering waste management, recycling, and circular economy solutions worldwide. Comparable as a large-scale operator in industrial and hazardous waste treatment with similar recycling-and-resource-recovery business model, though serving broader geographies and customer segments.
• Waste Management, Inc. North America's largest waste services company providing collection, transfer, recycling, and disposal. Comparable in vertical integration across the waste value chain and in pursuit of advanced recycling and renewable energy, though primarily U.S.-focused and serving municipal rather than industrial customers.
• Suez S.A. Global water and waste management company with substantial industrial waste treatment and recycling operations. Comparable in resource recovery, advanced sorting technology, and circular economy positioning, though at significantly larger scale and broader geographic reach.
• Clean Harbors, Inc. North American provider of environmental and industrial services including hazardous waste management and recycling. Comparable in treatment of regulated and industrial waste streams, with overlapping capabilities in recycling difficult materials, though operating in a different regulatory regime.

Others

• Toyota Tsusho Corporation: Japanese general trading company (sogo shosha) with growing circular economy and resource recycling businesses. Comparable as a Japanese player pursuing resource circulation partnerships and ESG-driven trading, though at a vastly larger scale and through trading and investment rather than direct plant operations.

Direct peers

• Kamigumi Co., Ltd. Japanese logistics company with growing environmental and recycling operations. Comparable as a Japan-based industrial waste handler serving construction and manufacturing customers with vertically integrated collection, treatment, and resource recovery services.
• Daiseki Co., Ltd. Japanese industrial waste management company offering collection, intermediate treatment, and recycling of industrial and specially controlled waste. Directly comparable in customer base (Japanese manufacturers and construction firms), service portfolio (waste treatment plus recycled material sales), and regulatory positioning.

Emerging players

• RENOVA, Inc. Japanese renewable energy and circular economy company focused on resource circulation and ESG-driven infrastructure. Comparable in the Japanese circular economy positioning and Scope 3 / decarbonization narrative, though primarily upstream in renewable power generation rather than waste treatment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/ishizakasangyo
• Instagraminstagram.com/santomekonjakumura
• LinkedInlinkedin.com/company/%E7%9F%B3%E5%9D%82%E7%94%A3%E6%A5%AD%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE

Compliance19 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 石坂産業株式会社