Fuel cell system

A fuel cell system that is mounted on a vehicle, the fuel cell system comprising:

• a fuel cell;
• a humidity sensor configured to detect a humidity in a vehicle cabin of the vehicle;
• a cathode off-gas exhaust passage through which cathode off-gas emitted from the fuel cell is exhausted to outside the vehicle;
• a plurality of introducing ports for cathode off-gas, provided in the cathode off-gas exhaust passage;
• a cathode off-gas introducing unit configured to introduce the cathode off-gas emitted from the fuel cell, from the plurality of introducing ports into the vehicle cabin of the vehicle, the cathode off-gas introducing unit comprising:
• a plurality of cathode off-gas introducing passages correspondingly connected to the plurality of introducing ports, and
• a plurality of open-close valves correspondingly in the plurality of cathode off-gas introducing passages;
• and
• a control unit configured to
• control an amount of the cathode off-gas introduced into the vehicle cabin of the vehicle in accordance with the humidity in the vehicle cabin of the vehicle, detected by the humidity sensor, and
• control an open-close state of each of the plurality of open-close valves corresponding to the plurality of introducing ports to adjust a humidity of the cathode off-gas introduced into the vehicle cabin of the vehicle.