To provide a fuel cell system wherein combustion efficiency of a burner is further increased, and stable combustion gas is secured.

In this fuel cell system equipped with a cell body to generate power by chemically reacting fuel having hydrogen produced from a hydrogen manufacturing device in a fuel processing system as a main substance with the air, the burner 23 provided in the combustion part 5a of the hydrogen manufacturing device is provided with a fuel jetting nozzle 31 to jet fuel and air jetting nozzles 30, 32 provided on the inner diameter side and outer diameter side of the fuel jetting nozzle 31 respectively to jet the air, and is structured so as to diffusely burn the fuel when operating the system for power generation.

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