Patent ID: 8350328

Claim:
A semiconductor device having a FINFET formed on a semiconductor substrate, the FINFET comprising: a channel layer arranged in an arch shape on the semiconductor substrate and formed of a semiconductor mainly made of monocrystalline silicon; a first gate insulating film formed so as to cover a part of an outside of the channel layer; a first gate electrode formed so as to cover the channel layer through the first gate insulating film; a second gate insulating film formed so as to cover an inside of the channel layer; and a second gate electrode formed so as to be buried inside the channel layer through the second gate insulating film, wherein the channel layer has the arch shape having: a sidewall portion arranged in a direction crossing a main surface of the semiconductor substrate; and a crosspiece portion arranged in a direction along the main surface so as to connect between tops of the two sidewall portions, and the second gate electrode arranged inside the channel layer having the arch shape is arranged so as to pass through the first gate electrode.