Patent ID: 8026576

Claim:
A wiring board comprising: a semiconductor substrate having a through hole and covered with an insulating film; a through electrode formed in the through hole; a first wiring connected to one end of the through electrode; and a second wiring connected to the other end of the through electrode, wherein the semiconductor substrate comprises: a semiconductor element including a first conductivity-type impurity diffusion layer having a different conductivity-type from that of the semiconductor substrate and electrically connected to the first wiring and the second wiring; a first guard ring formed to surround the through hole; and a second guard ring formed to surround the first conductivity-type impurity diffusion layer, the semiconductor element, the through electrode and the first guard ring, wherein the semiconductor element, the first guard ring, and the second guard ring are embedded in the semiconductor substrate, and wherein the second guard ring is formed along side surfaces of the semiconductor substrate on an upper surface side thereof.