Patent ID: 7144762

Claim:
A method of assembling a semiconductor device comprising: arranging, in a holding member comprising a plate-like body and a plurality of cylindrical support portions attached to said plate-like body for supporting pins, said pins having enlarged portions at one end thereof, the pins being loosely fitted in corresponding said plurality of cylindrical support portions; placing a heat sink on a substrate; moving at least one of said holding member and an assembly including the heat sink and the substrate placed one on another, toward each other to insert the pins held by said holding member in a plurality of holes in said heat sink and a plurality of holes in said substrate and to compress springs arranged in contact with the enlarged portions of the pins so that the heat sink and the substrate are closely contacted to each other; engaging ends opposite to the enlarged ends of said plurality of pins, passing through the plurality of holes in said heat sink and the plurality of holes in said substrate and protruding from the substrate, with an engaging member; and removing said holding member from said plurality of pins.