Patent ID: 8319333

Claim:
A power semiconductor module comprising: a circuit substrate including a metal heat sink and including a high thermal conductive insulation layer joined to one surface of the metal heat sink and including a circuit pattern provided on a surface of the high thermal conductive insulation layer, which surface is opposite to a surface joined to the metal heat sink; power semiconductor elements joined to the circuit pattern; a wiring metal plate for electrically connecting between the power semiconductor elements and between the power semiconductor elements and the circuit pattern; cylindrical main terminals that are joined, substantially perpendicularly, to the wiring metal plate and the circuit pattern, respectively; a cylindrical control terminal that is joined, substantially perpendicularly, to one of the power semiconductor elements; and transfer molding resin for sealing, at least, the high thermal conductive insulation layer, the circuit pattern, the power semiconductor elements, the wiring metal plate, outer side surfaces of the main terminals, and an outer side surface of the control terminal, wherein the main and control terminals each have an opening provided at a surface of the transfer molding resin.