To simplify a humidifying water circulation structure in a fuel cell system.

The humidifying water circulation structure has an exhaust manifold 53A1 arranged so as to cover all outlets of a fuel cell stack 100, and through which gas exhausted from the fuel cell stack 100 is to be guided to a condenser, and a water reservoir 53B1 connected through a connecting opening with the exhaust manifold 53A1, beneath the fuel cell stack 100. The reservoir 53B1 has a connecting part 53L on a position downstream of the vehicle running direction so that the reserved water can be sucked out by a supplying pump in order to supply to a jet nozzle. Thus, the circulation structure is simplified in that reserved water in the reservoir connected through the connecting opening with the exhaust manifold is supplied to the jet nozzle.

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