A power converter includes: a plurality of heat generators, at least some of which are arranged within a wind tunnel portion; and a housing for enclosing the wind tunnel portion through which a cooling air flows. The wind tunnel portion includes a first and second duct each having a cooling air inlet and outlet port, a cooling air flow path, and a blower fan. Further, the cooling air flow paths overlap with each other in a parallel arrangement relationship; the cooling air inlet ports of the first duct and the second duct, and the cooling air outlet ports of the first duct and the second duct are arranged adjacent to each other; and the heat generators divisionally arranged within the first duct and the second duct.