Patent ID: 7671383

Claim:
A semiconductor device, comprising: a first conductivity type semiconductor base having a main face; a hetero semiconductor region configured to contact the main face of the semiconductor base and to form a hetero junction in combination with the semiconductor base, the semiconductor base and the hetero semiconductor region in combination defining a junction end part; a gate insulating film configured to define a junction face in contact with the semiconductor base and to have a thickness; and a gate electrode disposed adjacent to the junction end part via the gate insulating film and configured to have a shortest interval between the junction end part and the gate insulating film and to define a shortest point in a position away from the junction end part by the shortest interval, a line extending from the shortest point to a contact point on the junction face substantially vertically relative to the junction face, forming such a distance between the contact point and the junction end part as to be smaller than the thickness of the gate insulating film contacting the semiconductor base.