Các thành viên chủ chốt

• 3 Diamonds Seafood Co.
• Asahi Glass Co.
• The Bank of Tokyo-Mitsubishi UFJ, Ltd.
• Kirin Brewery Co., Ltd.
• Meiji Yasuda Life Insurance Company
• Mitsubishi Electric Corporation
• Mitsubishi Estate Co.
• Mitsubishi Motors (Automobile manufacturing and sales)
• Mitsubishi Paper Mills, Ltd.
• Mitsubishi Plastics, Inc.
• Mitsubishi Rayon Co., Ltd.
• Mitsubishi Research Institute, Inc.
• Mitsubishi Shindoh Co., Ltd.
• Mitsubishi Steel Mfg. Co., Ltd.
• Mitsubishi UFJ Trust and Banking Corporation (part of Mitsubishi UFJ Financial Group)
• Mitsubishi UFJ Securities
• Nikon Corporation
• Nippon Oil Corporation
• NYK Line (Nippon Yusen Kabushiki Kaisha)
• P.S. Mitsubishi Construction Co., Ltd.
• Tokio Marine & Nichido Fire Insurance Co., Ltd.

Các tổ chức liên quan

• Atami Yowado
• Chitose Kosan Co., Ltd.
• Dai Nippon Toryo Co., Ltd.
• The Dia Foundation for Research on Ageing Societies
• Diamond Family Club
• Kaitokaku
• Koiwai Noboku Kaisha, Ltd.
• LEOC JAPAN Co., Ltd.
• Marunouchi Yorozu Corp.
• Meiwa Corporation
• Mitsubishi C&C Research Association
• Mitsubishi Club
• Mitsubishi Corporate Name and Trademark Committee
• Mitsubishi Economic Research Institute
• The Mitsubishi Foundation
• Mitsubishi Kinyokai
• Mitsubishi Marketing Association
• Mitsubishi Motors North America
• Mitsubishi Public Affairs Committee
• The Mitsubishi Yowakai Foundation
• MT Insurance Service Co., Ltd.
• Seikado Bunko Art Museum
• Shonan Country Club
• Sotsu Corporation
• The Toyo Bunko
• Seikei University