Patent ID: 8178977

Claim:
A semiconductor device comprising: a semiconductor substrate having a first surface and a second surface located on an opposite side to the first surface; an interlayer insulating film formed on the first surface of the semiconductor substrate; a first conductive film formed on the first surface of the semiconductor substrate via the interlayer insulating film; a concave portion formed on the second surface of the semiconductor substrate; a hole formed in a bottom surface of the concave portion and reaching the first conductive film; an insulating film formed on the bottom surface of the concave portion; and a second conductive film formed on the bottom surface of the concave portion via the insulating film and formed on a bottom surface of the hole so as to be electrically connected to the first conductive film, the hole, the insulating film, and the second conductive film configuring a through-hole electrode, and the through-hole electrode including: a first hole which configures the hole and reaches the interlayer insulating film from the bottom surface of the concave portion; a second hole which configures the hole and reaches the first conductive film from the bottom surface of the first hole, and whose hole diameter is smaller than that of the first hole; the insulating film formed on the bottom surface and a side surface of the first hole; and the second conductive film formed on the bottom surface and the side surface of the first hole and on the bottom surface of the concave portion via the insulating film, and formed on a bottom surface of the second hole so as to be electrically connected to the first conductive film.