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

Company Name	Yachiyo Engineering Co., Ltd.
Establishment	January 29, 1963
Registered Address (Head Office)	CS Tower, 5-20-8, Asakusabashi, Taito-ku, Tokyo, 111-8648, 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 NIIHARA Yuji
Board Member, Executive Officer YAMANAKA Kenjiro WATANABE Tomoaki NAKAYAMA Hirokuni
Auditors SUZUKI Hiroyuki KAKITANI Yuki
Senior Managing Executive Officer ISHIBASHI Yoshihiro ONO Masahito
Managing Executive Officer GOTO Koji
Executive Officer NISHIJIMA Takeshi HATA Kota SUMI Eigo AMAKATA Masazumi KASHIWAGI Hisanori FUJII Katsumi TAKEDA Yoshihiko KOHARA Junichi ISOBE Shigeru YOSHITANI Kazuyuki TSUDA Mitsunori
Capital	JPY 450 million
Revenues	JPY 28.34 billion (64th fiscal year：July 1, 2025 - June 30, 2026)
Number of Employees	1,405 (Technical Employees 1,072 and Administrative Employees 333) (as of July 1, 2026)
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 Soil Contamination Countermeasures Business Certified by the Minister of the Environment on May 26, 2026 (Registration Number：2021-8-2001)
Registration as Measurement Certification Business Sound Pressure Level：Certified by the Tokyo Metropolitan Government on November 1, 1993 (Registration Number：703). Oscillating Acceleration Level：Certified by the Tokyo Metropolitan Government on May 25, 1994 (Registration Number：971).
ISO Management System JIS Q 9001:2025 Quality Management System JIS Q 14001:2025 Environmental Management System JIS Q 27001:2025 Information Security Management System（Engineering Management Division's Digital Infrastructure Development Department and Digital Business Promotion Department's Solution Section) 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 (Head Office)

CS Tower, 5-20-8, Asakusabashi, Taito-ku, Tokyo, 111-8648, 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

NIIHARA Yuji

Board Member, Executive Officer

YAMANAKA Kenjiro

WATANABE Tomoaki

NAKAYAMA Hirokuni

Auditors

SUZUKI Hiroyuki

KAKITANI Yuki

Senior Managing Executive Officer

ISHIBASHI Yoshihiro

ONO Masahito

Managing Executive Officer

GOTO Koji

Executive Officer

NISHIJIMA Takeshi

HATA Kota

SUMI Eigo

AMAKATA Masazumi

KASHIWAGI Hisanori

FUJII Katsumi

TAKEDA Yoshihiko

KOHARA Junichi

ISOBE Shigeru

YOSHITANI Kazuyuki

TSUDA Mitsunori

Capital

JPY 450 million

Revenues

JPY 28.34 billion (64th fiscal year：July 1, 2025 - June 30, 2026)

Number of Employees

1,405
(Technical Employees 1,072 and Administrative Employees 333)
(as of July 1, 2026)

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 Soil Contamination Countermeasures Business

Certified by the Minister of the Environment on May 26, 2026 (Registration Number：2021-8-2001)

Registration as Measurement Certification Business

Sound Pressure Level：Certified by the Tokyo Metropolitan Government on November 1, 1993 (Registration Number：703).

Oscillating Acceleration Level：Certified by the Tokyo Metropolitan Government on May 25, 1994 (Registration Number：971).

ISO Management System

JIS Q 9001:2025 Quality Management System

JIS Q 14001:2025 Environmental Management System

JIS Q 27001:2025 Information Security Management System（Engineering Management Division's Digital Infrastructure Development Department and Digital Business Promotion Department's Solution Section)

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, 2026)
**Professional Certification**
PhD	19
Professional Engineer	584
Registered Civil Engineering Consulting Manager	187
APEC Engineer	1
1st Class Kenchikushi	27
Environmental Certified Measurers	16
Surveyors	55
Chief Telecommunications Engineer	7
Information Technology Engineer	69
Erosion Control Engineer	9