Patent ID: 8004045

Claim:
A semiconductor device comprising: a first fin-shaped semiconductor region formed on a substrate, the first fin-shaped semiconductor region having first-conductivity-type impurity region formed therein; a second fin-shaped semiconductor region formed on the substrate, the second fin-shaped semiconductor region having second-conductivity-type impurity region formed therein; a first gate insulating film formed so as to cover at least a side surface and an upper corner of a predetermined portion of the first fin-shaped semiconductor region, the upper corner of the first fin-shaped semiconductor region having a radius of curvature of r 1 under the first gate insulating film different from a radius of curvature of r 1 ′ outside the first gate insulating film; and a second gate insulating film formed so as to cover at least a side surface and an upper corner of a predetermined portion of the second fin-shaped semiconductor region, the upper corner of the second fin-shaped semiconductor region having a radius of curvature of r 2 under the second gate insulating film different from a radius of curvature of r 2 ′ outside the second gate insulating film, wherein r 1 ′ is greater than r 1 and less than or equal to 2×r 1 , and r 2 ′ is greater than r 2 and less than or equal to 2×r 2 .