Patent ID: 7291929

Claim:
A semiconductor device comprising a first semiconductor chip and a second semiconductor chip each having a principal surface and a rear surface, and a first wiring substrate laminated on the second semiconductor chip on the principal surface side thereof and on the rear surface side of the first semiconductor chip, the first semiconductor chip including a first concave electrode formed on the rear surface side thereof; the second semiconductor chip including a first electrode pad formed on the principal surface thereof, and a first protrusion electrode formed on the first electrode pad, and the first wiring substrate having a principal surface and a rear surface, and including: a first electrode pad formed on the principal surface side thereof, a first protrusion electrode formed on the first electrode pad, a first concave electrode having a recess formed from the rear side surface thereof to the first electrode pad, and connected to the first electrode pad, a second concave electrode having a recess formed from the rear surface to the principal surface thereof, and a first wiring formed on the rear surface side thereof, for electrically connecting the first concave electrode with the second concave electrode, wherein a part of the first protrusion electrode of the first wiring substrate is press-fitted in the recess of the first concave electrode of the first semiconductor chip, and a part of the first protrusion electrode of the second semiconductor chip being press-fitted in the recess of the second concave electrode of the first wiring substrate through deformation caused by plastic flow.