FUEL CELL SYSTEM

A fuel cell system (1A) comprises a casing (2) having a suction port (31) through which air is introduced from outside into an internal space thereof; a fuel cell (4) accommodated within the casing (2) and configured to generate electric power through an electrochemical reaction between a fuel gas and an oxidizing gas; an air supply unit (6) of a diaphragm type disposed within the casing (2) and configured to take in the air introduced through the suction port (31) and supply the air to the fuel cell (4); and a heating unit (30) disposed within the casing (2) and configured to heat the air in a space from the suction port (31) to the air supply unit (6).