To take appropriate action upon failure of a valve opening determination means of a valve in an air doorway in a fuel cell system.

The fuel cell system 10 includes a fuel cell body 20 and a control part 70, and the control part 70 includes an I/C outlet pressure sensor state determination module 72 having a function taking appropriate action upon failure of a pressure gage 60 and determining whether an I/C outlet pressure sensor which is the pressure gage 60 is normal; a doorway valve processing module 74 changing operation procedure of a doorway valve part including an air inlet valve 32 and an air outlet valve 34 upon starting of a fuel cell stack 22 when the pressure gage 60 is abnormal; an ACP processing module 76 changing the calculation procedure of loss electric power of an ACT 42; and a humidifying module bypass valve processing module 78 changing the opening and closing processing procedure of a humidifying module bypass valve 36.

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