Patent ID: 7483273

Claim:
A semiconductor module comprising: a circuit board; semiconductor devices mounted on both surfaces of the circuit board; and heat radiation plates provided to the both surfaces of the circuit board to cover the semiconductor devices, wherein the circuit board has a fitting hole through which the heat radiation plates are fitted, and wherein each of the heat radiation plates has a fitting edge portion in a position of the heat radiation plate that overlaps with a position in which the fitting hole is formed, and each of the heat radiation plates has a fixing member, which is provided at the fitting edge portion and integrally with the heat radiation plate, for fixing both of the heat radiation plates to the circuit board by caulking to align with the fitting hole, wherein each of the fixing members is received in said fitting hole, and wherein the fixing member formed on one of the heat radiation plates includes a fitting projection and the fixing member formed on the other of the heat radiation plates defines a fitted hole; and wherein the fitting projection has a first projection inserted into the fitting hole and a second projection extending from an end surface of the first projection and received in said fitted hole.