Patent ID: 6958520

Claim:
A semiconductor apparatus comprising: a semiconductor substrate having a first region and a second region isolated from the first region; a first semiconductor device which is formed in the first region and which includes a first gate insulating film of a silicon oxide single film formed on the semiconductor substrate, and a first gate electrode formed on the first gate insulating film; and a second semiconductor device which is formed in the second region and which includes a second gate insulating film of a single layer made of an insulating material of a dielectric constant different from that of the silicon oxide film, and a second gate electrode formed on the second gate insulating film; the semiconductor apparatus further comprising a first gate side wall insulating film formed on a side wall of the first gate electrode, and a second gate side wall insulating film formed on a side wall of the second gate electrode, wherein the first semiconductor device has an etching stopper film which is made of the same insulating material as that of the second gate insulating film and which covers the whole upper surface of the first gate electrode and at least a part of the first gate side wall insulating film.