Patent ID: 6927455

Claim:
A power semiconductor device including a power semiconductor element within an element configuration part having a central region and an outer peripheral region, comprising: a first semiconductor layer of a first conductivity type including a main surface extending across said central region and said outer peripheral region; a first insulator provided on said main surface to have a first opening within said central region and including a side surface forming said first opening; a second insulator provided on said side surface of said first insulator to narrow said first opening; a second semiconductor layer of a second conductivity type opposite said first conductivity type, provided in said main surface and including a first portion which forms part of said power semiconductor element within said central region and which extends on the side of said outer peripheral region to face said first insulator; and a third semiconductor layer of said first conductivity type provided in a portion of said main surface where said first portion is provided, forming another part of said power semiconductor element in said central region in said portion where said first portion is provided, and extending on the side of said outer peripheral region to be in contact with said second insulator, the third semiconductor layer not being in contact with said first insulator.