Yasuyuki Kasai is Commissioner, Japan Patent Office. He joined the Ministry of International Trade and Industry (Currently the Ministry of Economy, Trade and Industry) in 1990. He served as director for Economic Structure Policy, Economic and Industrial Policy Bureau, Ministry of Economy, Trade and Industry; counsellor, Fourth Department, Cabinet Legislation Bureau; director, Industry Revitalisation Division, Economic and Industrial Policy Bureau, Ministry of Economy, Trade and Industry; director for Industrial and Labor Policy, Cabinet Office; director, General Coordination Division, Japan Patent Office; deputy director-general, Economic and Industrial Policy Bureau, Ministry of Economy, Trade and Industry; director-general, National Space Policy Secretariat, Cabinet Office; councillor, Cabinet Secretariat. He has been in his current position since July 2025.