Patent ID: 7541245

Claim:
A semiconductor device manufacturing method comprising: depositing a first insulating film on a substrate, with a semiconductor layer interposed; forming an opening having a rectangular plane surface by selectively etching the first insulating film and the semiconductor layer; forming a pull-back section in accordance with a width of a first and second semiconductor films to be formed by selectively etching the first insulating film; forming an insulating film layer having a T-shaped cross section by filling the opening and the pull-back section with a second insulating film; forming the first and second semiconductor films having a thickness thinner than a gate length on a first and second side surfaces of the insulating film by etching the semiconductor layer with the insulating film layer as a mask after removing all of the first insulating film; and forming a gate electrode so as to interpose the insulating film layer and the first and second semiconductor films in between from upper side.