To provide a technology for unifying a cooling system of a fuel cell and a cooling system of an electric driving system, and making cooling medium circulating through both cooling systems using identical pump.

A radiator 102 for a fuel cell is arranged behind a radiator 101 for an electric driving system, then cooling water cooled at the radiator 102 for a fuel cell is branched and supplied to the radiator 101 for an electric driving system and the radiator 102 for a fuel cell from a pump 110. An electric driving system 104 is cooled by the cooling water cooled at both the radiator 102 for a fuel cell and the radiator 101 for an electric driving system, and a fuel cell 107 is cooled by the cooling water cooled at the radiator 102 for a fuel cell 107; and according to this, cooling process for the electric driving system 104 required for cooling relatively to a low temperature and of the fuel cell 107 cooled at higher temperature than the former can be carried out in proper balance by a pump 110.