as of October, 2026
Regular Members (Corporate); 24
Consultant
- IDEA Consultants, Inc.
- Eight-Japan Engineering Consultants Inc.
- ASIA CIVIL ENGINEERING CO.,LTD.
- OYO Corporation
- ORIENTAL CONSULTANTS Co.,Ltd.
- Oriental Consultants Global Co., Ltd.
- Katahira & Engineers International
- Kawasaki Geological Engineering Co., Ltd.
- CTI Engineering International Co., Ltd.
- CTI Engineering Co., Ltd.
- Central Consultant Inc.
- Dia Nippon Engineering Consultants Co., Ltd.
- CHODAI CO., LTD.
- NIPPON KOEI CO., LTD.
- NEWJEC Inc.
- Pacific Consultants Co., Ltd.
- Pacific Padeco International Co., Ltd.
- FUKKEN CO., LTD.
- Yachiyo Engineering Co, Ltd.
Survey
Supporting Members (Corporate); 42
Construction
- Arsocia Construction Co., Ltd.
- HAZAMA ANDO CORPORATION
- OBAYASHI CORPORATION
- KAJIMA CORPORATION
- Kumagai Gumi Co., Ltd.
- KONOIKE CONSTRUCTION CO., LTD.
- PENTA-OCEAN CONSTRUCTION CO., LTD.
- SHIMIZU CORPORATION
- SHO-BOND CORPORATION
- JFE Civil Engineering&Construction Corp.
- TAISEI CORPORATION
- Dai Nippon Construction
- TEKKEN Corporation
- TOA ROAD CORPORATION
- TOKYU CONSTRUCTION CO., LTD.
- TOYO CONSTRUCTION CO., LTD.
- TODA CORPORATION
- TOBISHIMA CORPORATION
- NISHIMATSU CONSTRUCTION CO., LTD.
- JDC CORPORATION
- THE NIPPON ROAD Co., Ltd.
- NIPPO CORPORATION
- P. S. Construction Co., Ltd.
- Fujita Corporation.
- MAEDA CORPORATION
Expressway
- Metropolitan Expressway Company Limited.
- Central Nippon Expressway Company Limited
- West Nippon Expressway Company Limited
- Japan Expressway International Company Limited
- Hanshin Expressway Company Limited
- East Nippon Expressway Company Limited
- Honshu-Shikoku Bridge Expressway Company Limited
Manufacturer
Please click here to download a list organizing the scope of services each consulting firm provides.