Federal Government

• The Ministry of Land, Infrastructure, and Transport
• The Ministry of Agriculture, Forestry, and Fisheries
• The Ministry of Environment
• The Ministry of Cabinet

Public Corporations

• Japan Highway Public Corporation
• Japan Railway Construction Public Corporation
• Teito Rapid Transit Authority (TRTA)
• The Metropolitan Expressway Public Corporation (MEPC)
• Honshu-Shikoku Bridge Authority
• Hanshin Expressway Public Corporation
• Japan Regional Development Corporation (JRDC)
• Narita Airport and Narita Airport Authority (NAA)
• Urban Development Corporation
• Water Resources Development Public Corporation
• Japan Sewage Works Agency
• JRCC JNR Settlement Headquarters

Local Public Bodies / Self-governing bodies

• Prefectures / the Largest Administrative Divisions (units) of Japan
• Cities designed by Ordinance
• Cities, Towns, and Villages

Others

• Foundations and Corporations
• The Third Public Sector
• JR (Japan Railway) Corporations
• Other Private Rail Companies
• General Contractors
• Architects
• Construction Consultants