Patent ID: 8334172

Claim:
A manufacturing method of a semiconductor device comprising the steps of: (a) preparing a wiring substrate that has a base material of resin, a wiring layer that is formed over each of the front surface and the rear surface of the base material and constitutes a circuit pattern, and an insulating film covering the wiring layer while exposing a part of the wiring layer; (b) sticking a semiconductor chip on a first surface side of the wiring substrate via an adhesive layer in a film shape; (c) coupling electrically plural electrode pads arranged over the surface of the semiconductor chip with plural bonding leads that contains a part of the wiring layer and is exposed from an opening formed in the insulating film by an electroconductive member; and (d) forming a resin sealing body that seals the semiconductor chip, the electroconductive member, and the adhesive layer in a film shape, wherein the wiring substrate in the step (a) has previously been subjected to the steps of: performing a first heat treatment at a temperature of from 100° C. to 150° C. for a first treatment time after forming the insulating film covering the wiring layer while exposing a part of the wiring layer; and performing a second heat treatment at a higher temperature than the temperature of the first heat treatment for a shorter second treatment time than the first treatment time prior to the first heat treatment.