Patent ID: 8247867

Claim:
A semiconductor device, comprising: a base layer having a first conductivity type; a source layer formed on said base layer and having a second conductivity type; an insulating film formed on said source layer; a plurality of gate structures penetrating said base layer; a plurality of conductive portions penetrating said insulating film and said source layer and electrically connected to said source layer and said base layer; and a source electrode formed on said insulating film and electrically connected to said conductive portions, wherein: said gate structures are formed in a stripe shape in plan view; parts in which said conductive portions are connected to said base layer are formed, in plan view, with a distance from said gate structures between said gate structures so as to be parallel to a direction of said stripe shape of said gate structures; and a dimension of a part in which said source layer and said base layer are in contact with each other between said gate structures and said conductive portions are 0.36 μm or more and 0.43 μm or less.