Denwa Daikou Service

What Denwa Daikou Service does

Denwa Daikou Service (電話代行サービス株式会社) is a privately held Japanese company, founded in 1990 and headquartered in Tokyo (Shibuya) with an operational call-center base in Osaka (Nishishin-Osaka, Yodogawa-ku). It provides outsourced, human-operated telephone answering and call center services to Japanese small and mid-sized businesses, with a current cumulative client base of more than 10,000 companies and reported contract continuation rate of 98.5% and call response rate of 98%+.

The service portfolio is organized in three tiers: three core products (secretary/telephone reception outsourcing, 24-hour night/holiday answering, and full call-center outsourcing), eleven industry-specific and use-case modules (real estate, legal/professional, plumbing, e-commerce, job-application reception, complaint handling, phone number rental, virtual office, etc.), and a Chat Report delivery system that pushes call summaries into Chatwork, Slack, Microsoft Teams, and LINE WORKS. The underlying technology is a human-operator platform supported by proprietary quality evaluation and customer-satisfaction management systems built over 30+ years; all operators work on-site under supervision rather than remotely, and the company is positioned publicly as the human-operator alternative to AI telephone agents.

The commercial model is sales-led and subscription-based, distributed via the company website, a toll-free 0120-888-882 inbound sales line, a referral/partner agent network, and content/SEO marketing through an extensive business-telephone-etiquette blog. Plans start from 7,000 JPY/month with per-call charges above included volume, mid-month prorating (e.g., 50% if started on the 16th), and bundle upsells into virtual-office and phone-number-rental services. Target customers are Japanese SMBs, individual entrepreneurs, and licensed professionals (lawyers, tax accountants, etc.) who need professional telephone coverage without hiring full-time reception staff.

Name

Denwa Daikou Service

Legal name

電話代行サービス株式会社

Website

https://denwadaikou.jp

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

51–100 employees

Short description

Denwa Daikou Service is a Japanese telephone answering and call center outsourcing company that provides 24/7/365 human-operated reception, virtual office, and nationwide phone number rental services to more than 10,000 small and mid-sized business clients across Japan.

Ownership category

akta.pro rank

Product category

Telephone Answering Services

NAICS

Telephone Answering Services (561421), Telephone Call Centers (56142), Telemarketing Bureaus and Other Contact Centers (561422)

SIC

Services-Help Supply Services (7363), Telephone Communications (No Radiotelephone) (4813), Services-Management Services (8741)

akta.pro primary industry

Numbering, DID, Porting & Carrier-of-Record Services (HDAIAHAK)

Keywords

• Telephone answering services
• Call center outsourcing
• Virtual office services
• Phone number rental
• Reception outsourcing

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Telephone Answering / Secretarial Services: Monthly subscription-based telephone answering services. Clients pay a recurring monthly fee for operator reception of their incoming calls, with pricing based on call volume, service hours, and customization level. Plans start from 7,000 JPY/month. The company uses a pay-per-call model in conjunction with base fees, where calls are counted and reported to clients.
2. Call Center Outsourcing: Full-scale call center operations outsourced to the company's operators, serving as an external BPO for client companies' inbound call operations.
3. Phone Number Rental / Lending: Rental of telephone numbers (Tokyo 03, Osaka 06, local area codes, 0120, 050) to clients who need dedicated business phone numbers, often combined with virtual office address services.
4. Virtual Office: Provides a business address in Tokyo (Shibuya) that can be used for company registration, business cards, and websites, combined with telephone answering and mail receiving services.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Denwa Daikou Service provides outsourced telephone answering and call center services, where trained human operators answer incoming calls on behalf of client businesses. The company also offers a virtual office service providing a Tokyo (Shibuya) business address, and a nationwide phone number rental service covering Tokyo 03, Osaka 06, regional area codes, 0120 toll-free, and 050 IP phone numbers. Services are delivered 24 hours a day, 365 days a year, and are customizable per industry.

Product overview

Denwa Daikou Service operates a multi-tiered telephone answering service with three core service levels (Secretary Service, Night/Holiday Service, and Call Center), supplemented by eleven specialized industry-specific modules covering real estate, legal/professional services, plumbing repair, and e-commerce, plus functional modules for complaint handling, job application reception, phone number rental, and virtual office services. The company differentiates through its made-to-order (OEM) approach, customizing operator scripts and response procedures for each client's specific industry and business requirements. The service is anchored by professional human operators available 24 hours a day, 365 days a year, with a reported contract retention rate of 98.5% and call response rate above 98%.

Differentiator

Problem solved

Functional benefit

Brands

• 電話代行サービス株式会社: Core telephone answering and call center outsourcing brand providing secretary services (秘書代行), night/holiday phone answering, call center services, virtual office, and nationwide phone number lending.
• 電話代行ビジネスインフォメーション

Products and services

• Secretary Service (Telephone Reception Outsourcing)

Quantifiable outcome

• Contract renewal rate of 98.5% — indicating very high customer satisfaction and retention
• +3 more outcomes

Named customers4 records

Segments7 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature3 records

Partnerships

One partnership is on record.

• 公益財団法人日本電信電話ユーザ協会 (Japan Telecom Users Association / JTUA)minorOthersThe company displays the JTUA certification/membership badge on its website footer, indicating affiliation with this telecommunications industry association. The JTUA is a public interest foundation that promotes proper telephone usage and conducts the telephone answering skill certification tests (もしもし検定 / Moshimoshi Kentei).

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Emerging players

• IVRy (株式会社IVRy): Japanese AI phone answering service that automates inbound call handling for SMBs using AI voice agents. Competes for the same SMB telephone-answering workload but with a software-only, non-human delivery model that threatens Denwa Daikou's labor-intensive positioning.
• AI Shift (株式会社AI Shift): AI-native Japanese contact center and customer service automation company offering AI voice bots for inbound call handling. Provides overlapping capability (telephone answering) to SMBs and enterprises via AI rather than human operators.
• Mobby (株式会社IVRyのMobby): AI-powered phone answering service from IVRy targeting Japanese SMBs with low monthly pricing and automated reception. Competes head-on with Denwa Daikou's core secretary service on price and convenience, representing the AI-led disruption in this category.

Direct peers

• fondesk (株式会社fondesk): fondesk is a Japanese telephone answering/secretarial service targeting SMBs and sole proprietors with per-call pricing. Directly competes with Denwa Daikou's core secretary service offering for the same SMB customer segment, including call coverage and message-taking workflows.
• Caster (株式会社キャスター): Caster is a Japanese online secretarial and assistant services company providing remote secretary, telephone reception, and BPO services to SMBs and professionals. Closely comparable business model (human-powered secretary outsourcing) and target customer base.
• Assistant (アシスタント電話代行): Japanese telephone answering service bureau providing outsourced call reception for SMBs and professionals, including 24/7 reception and after-hours coverage. Direct head-to-head competitor in the domestic telephone answering category.
• Hunglead (株式会社ハングリード): Hunglead is a Japanese telephone answering service offering inbound call reception, order-taking, and after-hours coverage for SMBs. Provides the same fundamental secretary-style service as Denwa Daikou in the same domestic market.

Broad incumbents

• TMJ (株式会社TMJ): Large Japanese contact center and BPO provider operating dozens of sites nationwide. Overlaps with Denwa Daikou on call center outsourcing but serves a broader enterprise customer base with multi-channel support offerings.
• BellSystem24 (ベルシステム24): One of Japan's largest call center and BPO operators, serving enterprise clients with large-scale inbound/outbound contact center operations. Comparable call-center outsourcing capability but at enterprise scale, broader portfolio beyond telephone answering.
• transcosmos (トランスコスモス): Major Japanese BPO and contact center operator with nationwide call center infrastructure. Offers overlapping telephone answering and customer service outsourcing but as part of a much broader digital and BPO services portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xtwitter.com/denwadaikou_s
• Facebookfacebook.com/denwadaikou
• Instagraminstagram.com/denwadaikou_service

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 Denwa Daikou Service