Patent ID: 8330233

Claim:
A semiconductor device comprising: a cell region formed with semiconductor elements; a periphery region formed on a periphery of the cell region; a first conduction type region of a first conductive type formed in the cell region and the periphery region; a plurality of first columnar regions of a second conductive type formed in the first conduction type region of the cell region; a plurality of second columnar regions of the second conductive type formed in the first conduction type region of the periphery region; and a plurality of electrical field buffer regions of the second conductive type formed on an upper part of each of the second columnar regions, wherein an interval between one of the electrical field buffer regions and an adjacent of one electrical field buffer regions is different between an interior side and an exterior side of the periphery region, and a distance between centers of one of the first columnar regions and an adjacent one of the first columnar regions, a distance between centers of one of the second columnar regions and an adjacent one of the second columnar regions, and a width of the first and the second columnar regions are equal.