A supporting member is a corporation, organization, or individual who contributes a support fee determined by the board of directors, in accordance with Article 41 of the Articles of Incorporation. The current supporting members are as follows:

• ATEC Yoshimura Co., Ltd.
• SE Corporation Osaka Branch
• OSAWA Urban Development Inc.
• OYO Corporation Kansai Office
• OKIKO Corporation Co., Ltd.
• KYOWA Sekkei Co., Ltd.
• Kubota ChemiX Co.,Ltd.
• SHOWA REKISEI Industries Co., LTD.
• KOKUSAI Kogyo Co., Ltd.
• SUNCOH Consultants Co., Ltd. Osaka Branch
• SHIMIZU Corporation Kansai Branch
• Kansai Geological Survey Co., LTD.
• TAISEI Corporation Kobe Branch
• DIA Nippon Engineering Consultants Co., Ltd.
• TOA Corporation Kobe Office
• TOA Road Corporation
• TOKYO Soil Research Co., Ltd. Kansai Branch
• Nara City
• NEWJEC Inc.
• HANSHIN Consultants Co., Ltd.
• HIROSE HOKYODO & Co., Ltd.
• YAMAMOTO Sekkei Co., Ltd.

supported by 22 members (July,2025 at present)