An anode separator 30 of a fuel cell 10 forms: a plurality of gas flow channels 45 arranged in parallel to let a fuel gas flow to an MEA 20; a supply passage 42 configured to supply the plurality of gas flow channels 45 with the fuel gas; and a recovery passage 48 configured to recover the fuel gas from the plurality of gas flow channels 45. The plurality of gas flow channels 45 include: a gas flow channel 45a connects the supply passage 42 and the recovery passage 48; and a gas flow channel 45b having the supply passage 42-side blocked.