Aioi Sangyo

What Aioi Sangyo does

Aioi Sangyo (相栄産業株式会社) is a Japanese automotive Tier supplier founded in 1941 in Sanjō, Niigata Prefecture, specializing in metal pressing parts for automobile manufacturers. The company operates a vertically integrated, one-stop production flow covering mold design and manufacturing, press processing (using a fleet ranging from 35t to 800t tandem, transfer, link-motion and hydraulic presses), welding and assembly with robotic automation, and painting/surface treatment (cationic electrodeposition). Its proprietary technical differentiators include irregular shape drawing (異形絞り加工) and high-tensile steel plate processing, both developed over decades to serve the requirements of lightweight automotive body components.

Aioi Sangyo's named customer relationships span Nissan Diesel (since 1952) and Nissan Motor (since 1959), together representing long-duration, deeply embedded OEM supply arrangements. Beyond auto body and structural components, it also supplies agricultural machinery and other transportation equipment manufacturers. The company markets through industry exhibitions (Intermold, Yanagisanjō Monozukuri Expo) and direct B2B engagement, with a Tokyo sales office supporting Greater Tokyo accounts and a wholly-owned Indonesian manufacturing subsidiary (PT. Aiei Engineering Indonesia, acquired in full in 2020) supporting its overseas expansion.

The company has pursued regulatory credibility through ISO 9001 and ISO 14001 certifications (upgraded to the 2015 revisions in 2018). In 2023 it launched a foreign human resources introduction business leveraging its Indonesian presence to address Japanese labor shortages, signaling modest diversification outside pure metal pressing. Revenue, pricing, and contract terms are not publicly disclosed; all sales are conducted through direct B2B quotations tailored to customer specifications.

Name

Aioi Sangyo

Legal name

相栄産業株式会社

Website

https://aiei-sangyo.co.jp

Company type

Private

Founded year

1941

Operating status

Operating

Headcount range

11–50 employees

Short description

Aioi Sangyo is a Japanese automotive parts manufacturer founded in 1941 in Sanjō, Niigata, supplying metal-pressed body and structural components to Nissan and Nissan Diesel through one-stop in-house mold design, pressing, welding, painting, and assembly.

Ownership category

akta.pro rank

Product category

Automotive Metal Press Parts Manufacturing

NAICS

Machine Shops (33271)

SIC

Metal Forgings & Stampings (3460), Sheet Metal Work (3444), Truck & Bus Bodies (3713)

akta.pro primary industry

Truck Body & Upfit Manufacturing (Box/Dump/Service/Refuse) (IMACAGAC)

akta.pro secondary industry

Specialty Vehicle Body Manufacturing (Emergency/Military/Mobile Clinics) (IMACAGAD)

Keywords

• Automotive metal stamping
• Mold design manufacturing
• Metal press processing
• Automotive parts supplier
• Welding assembly services

Headquarters

HQ city

Sanjo

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. 自動車金属プレス部品製造販売: 相栄産業 designs, manufactures, and sells automotive metal pressing parts (including body panels, structural components, and precision-machined metal parts) to automobile manufacturers and other transportation equipment makers. Revenue is generated through long-term supply contracts with automotive OEMs and Tier-1 suppliers. The company offers a one-stop production flow — from mold design through pressing, welding, painting, and assembly — enabling cost efficiency and delivery speed for customers.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Aioi Sangyo designs and manufactures automotive metal press parts as a one-stop supplier, providing in-house mold design and mold manufacturing, press processing, welding and assembly, and cationic electro-deposition painting/coating. The company produces small-to-large pressed metal components — including body panels, structural parts, and precision machined metal parts — primarily for major Japanese automakers and other transportation equipment manufacturers, with specialized expertise in irregular shape drawing and high-tensile steel plate processing.

Product overview

Aioi Sangyo is a comprehensive metal processing manufacturer offering one-stop production from mold design and manufacturing to press processing, welding, assembly, and painting. Their core product is automotive press parts (small to large), supported by five integrated service modules: mold design/manufacturing, press processing (utilizing tandem to transfer presses), welding and assembly (with multi-axis robotic automation), and painting/surface treatment (cationic electro-deposition). They specialize in complex shape drawing processing and high-tensile steel plate processing technologies.

Differentiator

Problem solved

Functional benefit

Products and services

• Automotive Press Parts (自動車用プレス部品) Metal press-processed automotive components ranging from small to large parts, manufactured via in-house mold design, press processing, welding, assembly, and painting, supplied to automotive manufacturers including Nissan.
• Mold Design and Manufacturing (金型設計・製作) In-house mold design and manufacturing services that enable flexible production from small to large automotive parts with precision and quality control.
• Press Processing (プレス加工) Large to medium-small press line capabilities covering all parts manufacturing, utilizing tandem and transfer press equipment for varying production volumes.
• Welding and Assembly (溶接・組立加工) Multi-faceted welding technologies including TIG, CO2, projection welding, and spot welding with robotic automation for efficient high-performance assembly.
• Painting and Surface Treatment (塗装・表面処理) High-weather-resistant coating using cationic electro-deposition painting equipment achieving rust prevention and durable surface finish.
• Special Shape Drawing Processing (異形絞り加工) Specialized drawing process for complex-shaped automotive parts, including developed high-tensile steel plate processing technology.

Quantifiable outcome

• Reduced delivery time and cost through one-stop in-house production covering mold design, pressing, welding, painting, and assembly
• +2 more outcomes

Named customers2 records

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• PT. Guna Senaputra Sejahtera (印尼合弁相手方)coreStrategic or Co-development Partner · 1 January 2013Indonesian metal pressing company that entered into a joint venture agreement with 相栄産業 in 2013. This partnership was the foundation for establishing two joint venture companies in Indonesia — PT.AieiGunasenaEngineering (engineering and stamping) and PT.AieiGunasenaStamping (stamping) — in 2014. PT.AieiGunasenaEngineering was fully acquired in 2020 and renamed PT.Aiei Engineering Indonesia. PT.AieiGunasenaStamping was sold in 2022, with a business partnership agreement maintained with the buyer.

Scale indicators4 records

Recent moves12 records

Expansion highlights4 records

Direct peers

• F-Tech Inc. Japanese manufacturer specializing in chassis and frame pressed components for Honda and other OEMs. Highly comparable product category (structural automotive stampings) with integrated manufacturing similar to Aioi Sangyo.
• Yorozu Corporation: Japanese automotive stamping specialist producing suspension, frame, and drivetrain pressed components for major OEMs. Closest scale-and-product analogue to Aioi Sangyo's automotive press parts business, with multi-decade Nissan and other OEM relationships.
• Kanto Auto Works, Ltd. Honda group body parts manufacturer with comparable press, welding, and assembly operations. Similar one-stop supplier role within a single OEM ecosystem.
• Howa Machinery, Ltd. Japanese manufacturer of automotive pressed components and industrial machinery, with similar dual capabilities in metal pressing and equipment manufacturing. Comparable mid-sized Japanese industrial profile.
• Nissan Shatai Co., Ltd. Nissan group body manufacturer performing press welding and assembly of vehicle bodies and components. Same customer group as Aioi Sangyo with overlapping press, weld, and paint processes.
• Kasai Kogyo Co., Ltd. Japanese manufacturer of automotive interior and exterior parts using metal stamping, welding, and painting. Directly comparable one-stop production profile and customer mix to Aioi Sangyo.
• Honda Lock Mfg. Co., Ltd. Honda group manufacturer of locks, latches, and metal stamped components for vehicles. Comparable Japanese mid-sized automotive metal stamping and assembly peer with deep single-OEM dependency.

Broad incumbents

• Aisin Corporation: Major Japanese Tier-1 automotive supplier with stamping operations embedded within a broad drivetrain, body, and chassis portfolio. Broader incumbent in the same metal stamping space as Aioi Sangyo.
• Toyota Auto Body Co., Ltd. Toyota group vehicle body parts manufacturer running large-scale press welding and assembly. Operates the same core processes as Aioi Sangyo at substantially greater scale.
• Toyotetsu Co., Ltd. Toyota group stamping and body parts manufacturer. Larger scale and broader Toyota program coverage, but operates the same press-weld-paint value chain as Aioi Sangyo.

Market position

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/pt-aiei-engineering-indonesia

Compliance3 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 Aioi Sangyo