Fuel cell system

The fuel cell system (100) includes a fuel cell stack (30), a fuel supply (10) supplying a fuel to the fuel cell stack (30), and an oxidizing agent supply (20) supplying an oxidizing agent to the fuel cell stack (30). The fuel cell stack (30) includes a first end plate (31), a moisture exchanger (40), an electrical generator (50), and a second end plate (32). The moisture exchanger (40) includes a first area where a dried supply oxidizing agent flows, a second area where a humid emission fuel flows, and a third area where a humid emission oxidizing agent flows, and the first area exchanges moisture with the second and third areas using a moisture exchange layer.