Patent ID: 8258618

Claim:
A power semiconductor module comprising: a circuit substrate including a metal heat sink and including a thermal conductive insulation layer joined to one surface of the metal heat sink and including a wiring pattern provided on a surface of the thermal conductive insulation layer, which surface is opposite to a surface joined to the metal heat sink; power semiconductor elements joined to element mounting portions of the wiring pattern; a cylindrical external terminal communication section joined to the wiring pattern so as to be substantially perpendicular to the wiring pattern; circuit forming means for electrically connecting between the power semiconductor elements, electrically connecting between portions of the wiring pattern, and electrically connecting between the power semiconductor elements and the wiring pattern; and transfer molding resin for sealing at least the wiring pattern, the power semiconductor elements, the cylindrical external terminal communication section, and the circuit forming means, wherein the cylindrical external terminal communication section is a metal cylinder, and the cylindrical external terminal communication section has a hole fully filled with gel so that an external terminal is able to be interchangeably press fitted into the hole.