Patent ID: 7355278

Claim:
A mold die comprising a first die having a recess of a predetermined form and a second flat die, said first die to be disposed on a surface of a wiring board which has a plurality of openings including a bonding opening and a semiconductor chip mounted on said surface via an elastic material, and said second die to be disposed on a back of said surface of said wiring board on which said semiconductor chip is mounted, for sealing with an insulating resin a periphery of said semiconductor chip and at least said bonding opening of said wiring board, wherein said second die comprises a loop-shaped protrusion disposed in a loop surrounding an area overlapping said bonding opening to be sealed with said insulating resin and has generally flat plate-shape surfaces in areas within and outside said loop-shaped protrusion recessed from said loop-shaped protrusion, said loop-shaped protrusion being configured to press said wiring board toward said semiconductor chip around said area overlapping said bonding opening.