Patent ID: 6992358

Claim:
A semiconductor device comprising: an underlying insulating film having a depression; a semiconductor structure which includes a first semiconductor portion having a portion formed on the underlying insulating film and a first overlap portion which overlaps the depression and containing an impurity element for source/drain, a second semiconductor portion having a portion formed on the underlying insulating film and a second overlap portion which overlaps the depression and is disposed to face the first overlap portion and containing an impurity element for source/drain, and a third semiconductor portion disposed between the first and second semiconductor portions and having a portion disposed above the depression, wherein overlap width of the first overlap portion and overlap width of the second overlap portion are equal to each other; a gate electrode including a first electrode portion covering upper and side surfaces of the third semiconductor portion and a second electrode portion formed in the depression, wherein the second electrode portion has a bottom which is formed on the underlying insulating film; and a gate insulating film interposed between the semiconductor structure and the gate electrode.