FUEL CELL SYSTEM

A fuel cell system including a fuel cell stack configured to generate electric power using an anode gas and a cathode gas includes: a microprocessor configured to perform a series of power generation controls including an activation control based on an activation instruction, a normal power generation control based on a power generation target, and a stop control based on a stop instruction; and a normally-closed control valve including a movable valve body that abuts a seal member of a valve seat portion in a closed state. When the microprocessor determines that the control valve has not been opened before the stop control in the series of power generation controls, the microprocessor performs, in the stop control, a forced valve-opening process for opening the control valve.