Company Profile｜Company Information｜Yachiyo Engineering Co., Ltd.

Company Name	Yachiyo Engineering Co., Ltd.
Establishment	January 29, 1963
Registered Address (Headquarters)	5-20-8, Asakusabashi, Taito-Ku, Tokyo, Japan
Board of Directors	Chairman DEMIZU Shigemitsu
President TAKAHASHI Tsutomu
Executive Vice President HASEGAWA Kiyoshi MIZUNO Takashi
Board Member, Senior Managing Executive Officer MAMA Shuichi
Board Member, Managing Executive Officer KOBAYASHI Yukihiro
Board Member TAJIMA Shinichi
Board Member, Executive Officer YAMANAKA Kenjiro WATANABE Tomoaki NAKAYAMA Hirokuni
Auditors SUZUKI Hiroyuki SASAKI Kazunari
Senior Managing Executive Officer ISHIBASHI Yoshihiro
Managing Executive Officer GOTO Kouji
Executive Officer KASHIWAGI Hisanori SATO Takuya TSUDA Mitsunori SUMI Eigo FUJII Katsumi YOSHITANI Kazuyuki KOHARA Junichi ISOBE Shigeru NISHIJIMA Takeshi TAKEDA Yoshihiko
Capital	JPY 450 million
Amount of Contracts	JPY 26.9 billion (as of June 30, 2025)
Number of Employees	1,366 (Technical Employees 1,070 and Administrative Employees 296) (as of July 1, 2025)
Business Areas	Consulting engineering services in the following fields: Urban Planning, Private Sector Development, Architecture, Solid Waste Management, Water Supply, Wastewater, Water Resources Management, Roads and Bridges, Railway, Transport Planning, Electricity and Power, Renewable Energy, Broadcasting, Information and Communication Technology.
Registration	Registration as Engineering Consultant Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on October 1, 2024
Registration as Surveyor Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on April 8, 2024 (Registration Number：16-613).
Registration as First-class Architect Office Certified by the Tokyo Metropolitan Government on March 14, 2022 (Registration Number：4554).
Registration as Geotechnical Consultant Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on November 30, 2022
Registration as Weights and Measures Inspector Certified by the Tokyo Metropolitan Government on November 1, 1993 . Certified by the Governor of Tokyo on November 1, 1993
ISO Management System JIS Q 9001:2025 Quality Management System JIS Q 14001:2025 Environmental Management System JIS Q 27001:2023 Information Security Management System（Information Technology Department) JIS Q 55001:2017 Asset Management System（Social Management Business Office of the Consulting Headquarters and Consulting Section V, River Department of the Consulting Headquarters）

Company Name

Yachiyo Engineering Co., Ltd.

Establishment

January 29, 1963

Registered Address (Headquarters)

5-20-8, Asakusabashi, Taito-Ku, Tokyo, Japan

Board of Directors

Chairman

DEMIZU Shigemitsu

President

TAKAHASHI Tsutomu

Executive Vice President

HASEGAWA Kiyoshi

MIZUNO Takashi

Board Member, Senior Managing Executive Officer

MAMA Shuichi

Board Member, Managing Executive Officer

KOBAYASHI Yukihiro

Board Member

TAJIMA Shinichi

Board Member, Executive Officer

YAMANAKA Kenjiro

WATANABE Tomoaki

NAKAYAMA Hirokuni

Auditors

SUZUKI Hiroyuki

SASAKI Kazunari

Senior Managing Executive Officer

ISHIBASHI Yoshihiro

Managing Executive Officer

GOTO Kouji

Executive Officer

KASHIWAGI Hisanori

SATO Takuya

TSUDA Mitsunori

SUMI Eigo

FUJII Katsumi

YOSHITANI Kazuyuki

KOHARA Junichi

ISOBE Shigeru

NISHIJIMA Takeshi

TAKEDA Yoshihiko

Capital

JPY 450 million

Amount of Contracts

JPY 26.9 billion (as of June 30, 2025)

Number of Employees

1,366
(Technical Employees 1,070 and Administrative Employees 296)
(as of July 1, 2025)

Business Areas

Consulting engineering services in the following fields:
Urban Planning, Private Sector Development, Architecture, Solid Waste Management, Water Supply, Wastewater, Water Resources Management, Roads and Bridges, Railway, Transport Planning, Electricity and Power, Renewable Energy, Broadcasting, Information and Communication Technology.

Registration

Registration as Engineering Consultant

Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on October 1, 2024

Registration as Surveyor

Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on April 8, 2024 (Registration Number：16-613).

Registration as First-class Architect Office

Certified by the Tokyo Metropolitan Government on March 14, 2022 (Registration Number：4554).

Registration as Geotechnical Consultant

Certified by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan on November 30, 2022

Registration as Weights and Measures Inspector

Certified by the Tokyo Metropolitan Government on November 1, 1993 .

Certified by the Governor of Tokyo on November 1, 1993

ISO Management System

JIS Q 9001:2025 Quality Management System

JIS Q 14001:2025 Environmental Management System

JIS Q 27001:2023 Information Security Management System（Information Technology Department)

JIS Q 55001:2017 Asset Management System（Social Management Business Office of the Consulting Headquarters and Consulting Section V, River Department of the Consulting Headquarters）

Total Number of Qualified Personnel (as of July 1, 2024)
**Staff Composition**
ICT Engineer	18
Economist	29
Civil Engineer	799
Geological Engineer	46
Architect	45
Mechanical Engineer	17
Electrical Engineer	30
Environmental Expert	85
BIM/ CAD Expert	10
Administrative Staff	287

Professional Certification
PhD	22
Professional Engineer	567
Registered Civil Engineering Consulting Manager	184
APEC Engineer	1
1st Class Kenchikushi	23
Environmental Certified Measurers	12
Surveyors	51
Chief Telecommunications Engineer	6
Information Technology Engineer	58
Erosion Control Engineer	8