Patent ID: 8338944

Claim:
A semiconductor device, comprising: a semiconductor module that has a joint surface, a first fitting portion and a second fitting portion provided on the joint surface of the semiconductor module, the second fitting portion having a shape different from the first fitting portion; and a radiating fin that has a joint surface, a third fitting portion and a fourth fitting portion provided on the joint surface of the radiating fin, the fourth fitting portion having a shape different from the third fitting portion; wherein the semiconductor module is bonded to the radiating fin so that the first fitting portion is fitted into the third fitting portion or the third fitting portion is fitted into the first fitting portion, and the second fitting portion is fitted into the fourth fitting portion or the fourth fitting portion is fitted into the second fitting portion; the semiconductor module is fixed to the radiating fin by a screw penetrating the joint surfaces of the semiconductor module and the radiating fin; the first fitting portion has a shape not to fit into the fourth fitting portion and the fourth fitting portion has a shape not to fit into the first fitting portion; and the second fitting portion has a shape not to fit into the third fitting portion and the third fitting portion has a shape not to fit into the second fitting portion.