A fuel cell system for a vehicle (1) includes a fuel cell (14) configured to react fuel gas and oxidizing gas with each other and generate electricity; a system frame (20) fixed under a floor of a body of the vehicle and supporting the fuel cell (14); a driving motor (43) configured to drive the vehicle, arranged in a motor compartment (R2); and a high-voltage cable (101, 102) configured to transmit high-voltage power generated by the fuel cell (14) to the driving motor (43), the high-voltage cable (101, 102) having apart extended across the system frame, the part is arranged on an inner side of the system frame (20) and is along a frame member (22) of the system frame (20).