| Ando Corporation | Nishihara Environmental Sanitation Research Co. |
| Chiyoda Corporation | Nishinippon Plant Engineering |
| Chugai Ro Co., Ltd. | Nissan Construction Co., Ltd. |
| Dai Nippon Construction Co. | NTT Me Kansai Corporation |
| Ebara Plant Construction Co., Ltd. | NTT Telecom Engineering Chugoku Corp. |
| Ericsson Toshiba TCS. K·K， | OAC Architects Planners Engine |
| Fujita Corporation | Ohbayashi Corporation |
| Fukuda Corporation | Onoda Chemico Co., Ltd. |
| Haseko Corporation | Onoda Engineering Co, Ltd. |
| Hazama Corporation | P.S. Corporation |
| IHI Plantech Co., Ltd. | Penta-Ocean Construction Co., Ltd. |
| Ishimoto Architectural & Eng. | Raymond Architectural Design |
| Japan Development & Construction | Sangetsu Co., Ltd. |
| JGC Corporation | Schal Bovis, Inc. |
| K. Itow Architects & Engineers | Shimizu Corporation |
| K. Mori Architect Inc. | Sumitomo Construction Co. |
| Kajima Corporation | Sumitomo Densetsu Co., Ltd. |
| Kandenko Co.，Ltd. | Sumitomo Forestry Co., Ltd. |
| Kansai International Airport Company, Ltd. | Systems Engineering Consultants Co., Ltd. |
| Kinden Corporation | Taihei Kogyo Co., Ltd. |
| Koyo Iron Works & Construction Co., Ltd. | Taisei Corporation |
| Kume Sekkei Co.，Ltd. | Takenaka Komuten Co., Ltd. |
| Kyudenko Corporation | Tekken Construction Co., Ltd. |
| Lafarge(法国拉法基) | The Nippon Road Co., Ltd. |
| Marubeni Setsubi Corporation | Toa Corporation |
| Matsuda，Hirata&Sakamoto，Arch | Tobishima Corporation |
| Misawa Homes Co.，Ltd. | Toda Construction Co., Ltd. |
| Mitsubishi Chemical Engineering Corporation | Tohoku Electric Power Engineering & Construction |
| Mitsubishi Heavy Industries Erection Co., Ltd. | Tokyo Denki Komusho Co., Ltd. |
| Mitsui Construction Co., Ltd. | Tokyo Electric Power Service |
| Modec, Inc. | Tokyo Engineering Consultants |
| Nagasaki Semmpaku Sobi Co.，Ltd. | Tokyu Construction Co., Ltd. |
| Nihon Architects, Engineers | Toyo Tsusin Kogyo Co., Ltd. |
| Nikken Sekkei，Ltd. | Yachiyo Engineering Co., Ltd. |
| Ericsson | Yamashita Architects & Eng. |
| Nippon Hodo Co., Ltd. | Yokogawa Johnson Controls Corporation |
| Nippon Koei Co.，Ltd. | Yurtec |
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