Patent ID: 8269315

Claim:
A semiconductor device comprising: a semiconductor substrate; a through hole formed penetrating through a first surface and a second surface of said semiconductor substrate; a first insulating layer having an opening above an opening portion on the first surface side of said through hole, formed on the first surface of said semiconductor substrate; a first conductor layer in a pattern formed in a region where the opening is not formed on said first insulating layer; a second insulating layer having an opening above the opening portion on the first surface side of said through hole, formed to cover said first conductor layer and said first insulating layer in a region where said first conductor layer is not formed; a second conductor layer electrically connected with said first conductor layer, formed on said second insulating layer to cover the opening of said second insulating layer; a third insulating layer having a first portion formed on the second surface of said semiconductor substrate, a second portion formed in said through hole, and a third portion formed on the rear surface of the first insulating layer, the first, second, and third portions being connected with each other, the third portion having an opening; and a third conductor layer internally contacting said second conductor layer via the opening of said third insulating layer, continuously formed in said through hole and on said third insulating layer on the second surface of said semiconductor substrate, wherein the opening of said first insulating layer and the opening of said second insulating layer are smaller in diameter than said through hole and formed coaxially with said through hole, wherein the opening of the third portion of said third insulating layer is the same in diameter as the opening of said first insulating layer and the opening of said second insulating layer and formed coaxially with these openings.