Patent ID: 8022525

Claim:
A semiconductor device having a plurality of wafers which are laminated to each other, wherein: each wafer includes a lamination surface to which another wafer is laminated and a substrate having an element formed thereon; the lamination surface is provided with an electric signal connecting portion that electrically connects to said another wafer so as to form a semiconductor circuit; at least one of the electrical signal connecting portions facing each other is a protruding connection portion that protrudes from a region which exposes the substrate having the protruding connection portion on the lamination surface; and a reinforcing protruding portion that is insulated from the semiconductor circuit, and is formed of the same material as that of the substrate from which the reinforcing protruding portion is formed to protrude from the lamination surface with a height equal to the length of a gap between the lamination surfaces of wafers facing each other is provided in an area where the protruding connection portion is not disposed on the lamination surface formed with the protruding connection portion.