Patent ID: 7531876

Claim:
A semiconductor device, comprising: a first-conduction type semiconductor substrate; a first layer having the first-conduction type which is formed on one surface of the first-conduction type semiconductor substrate; a second-conduction type layer which is formed in a prescribed region of the surface of the first layer having the first-conduction type; a first main electrode which is formed to be electrically connected to the second-conduction type layer; a second main electrode which is formed on the other surface of the first-conduction type semiconductor substrate; a through hole which is formed to pierce through the first-conduction type semiconductor substrate and the first layer having the first-conduction type; a conductive portion which is formed within the through hole and connected to the second main electrode; an electrode pad which is formed on the same surface side of the first-conduction type semiconductor substrate as the first main electrode and connected to the conductive portion; and a second layer having the first-conduction type which is formed in a prescribed region of the surface of the first layer having the first-conduction type not to come into contact with the second-conduction type layer, wherein the through hole is formed in a region where the second layer having the first-conduction type is interposed between the through hole and the second-conduction type layer.