Patent ID: 8456014

Claim:
A semiconductor device comprising: a semiconductor device layer having at least one semiconductor device therein; a multilayered wiring section formed of a plurality of wiring layers and a plurality of interlayer insulating films; an external connection electrode formed on one of the plurality of wiring layers; and an opening formed in a concave shape extending from and through the semiconductor device layer and through a portion of the multilayered wiring section between the semiconductor device layer and the external connection electrode so as to expose a surface of the external connection electrode, wherein, the opening has a larger opening diameter at an end farther from the external connection electrode than at another end closer to the external connection electrode, an insulating layer surrounding an outside of the opening is formed inside of the semiconductor device layer so that the insulating layer does not cover side surfaces of the opening, and the insulating layer is disposed within trenches penetrating through the semiconductor device layer in a thickness direction of the semiconductor device layer.