To enhance heat release efficiency of a refrigerant radiator for a fuel cell and a refrigerant radiator for cooling without interfering with air passing through the radiator.

In the radiator cooling system 12 for the fuel cell, a fuel cell radiator 40 and an auxiliaries radiator 56 are vertically arranged on a vehicle floor surface 18, and the refrigerant radiator 50 for cooling is arranged in parallel to the vehicle floor surface 18. A cooling fan 62 is inclinedly arranged on the vehicle floor surface 18 such that outside air is forcedly passed through all of a forced air passing part 40a of the fuel cell radiator 40, the refrigerant radiator 50 for cooling and the auxiliaries radiator 56. The refrigerant radiator 50 for cooling and the cooling fan 62 are arranged at a front side of the vehicle more than the fuel cell radiator 40 and near a back side of a front bumper 17. In the radiator cooling system 12 for the fuel cell, the air passing through the respective radiators is not made warm and is not obstructed by the other radiator.

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