Abstract: In a power semiconductor device having a power circuit 1 and a control circuit 2 incorporated in a resin case 4, said circuits being mounted on different substrates 1a and 2a and interconnected internally, and power terminals 6 and control terminals 7 connected to the power and control circuits, respectively, being drawn out of the case, the power terminals 6, the control terminals 7 and lead pins 13 are preliminarily molded by an insert technique together with the case as the power terminals 6 and the control terminals 7 are arranged at the peripheral edge of the case 4 whereas the lead pins 13 for establishing interconnection between the power and control circuits are arranged on a pin block 12 provided at the middle stage within the case, and the substrate 1a for the power circuit is mounted on a heat dissipating metal base 11 combined with the bottom side of the case 4 and the substrate 2a for the control circuit on the pin block 12, with the power terminals, control terminals and the pin block being sold