A power module composite includes a power module (34) in which switching devices (32) included in an electric-power conversion circuit are molded, a driver module (37) that includes a control circuit (35) for controlling the switching devices (32) and is molded, a housing (39) containing the power module (34) and the driver module (37), and a heat sink (38) that is fixed to the housing (39) and refrigerates the switching devices (32); the power module 34 and the driver module 37 are mounted in that order on the heat sink (38) in such a way as to be superimposed on each other.