Patent ID: 7723838

Claim:
A semiconductor device comprising: a wiring board; and at least one semiconductor element buried in the wiring board, wherein the wiring board includes: an insulating base material consisting of a single resin layer, and having a first surface and a second surface opposite to the first surface; a conductor filled in a first via hole which is formed in a region around the semiconductor element to pierce the insulating base material in a thickness direction, one end of the conductor being covered with a first pad portion which is made of conductive material and which is at the level of the first surface of the insulating base material; a wiring layer having a required pattern shape formed on the second surface of the insulating base material, the wiring connecting another end of the conductor, via a second via hole, to an electrode terminal of the semiconductor element, the second via hole being formed in the insulating base material; and a protective film formed to cover the wiring layer and the second surface of the insulating base material, with a second pad portion exposed, the second pad portion being delimited in a portion of the wiring layer which corresponds to another end of the conductor, and wherein the semiconductor element is buried in the insulating base material with a semiconductor surface thereof which has the electrode terminal formed thereon being directed to the second surface of the insulating base material; and a surface thereof opposite to the surface having the electrode terminal formed thereon being covered with an insulating layer exposed at the first surface of the insulating base material.