Patent ID: 8117742

Claim:
A method of manufacturing a semiconductor device comprising the steps of: (a) providing a mold including a first mold having a cavity and an air vent communicated with the cavity, a second mold opposed to the first mold, a movable pin formed in the first mold such that the movable pin is protruded into the air vent, and a movable pin driving spring connected with the movable pin; (b) disposing a wiring board, on which a semiconductor chip is mounted, including a plurality of wiring layers on a surface of the second mold; (c) after the step (b), clamping the wiring board with the first and second molds; and (d) after the step (c), injecting a sealing resin in the cavity, wherein a groove is formed at an end face of the movable pin as a pathway of air; and wherein in the step (c), contacting the end face of the movable pin with the wiring board by clamping the mold, and raising the movable pin by clamping the mold, and closing the mold.