Patent ID: 8912593

Claim:
A semiconductor device comprising: a first stacked body including a first insulating film and a first conductive film alternately stacked in a plurality and including a plurality of stairs processed in a staircase configuration; an interlayer insulating film provided on the stairs so as to fill a level difference between the stairs; a second stacked body provided on the interlayer insulating film and on an uppermost stair and including a second conductive film and a second insulating film provided on the second conductive film, the second conductive film being thicker than the first conductive film and including a select gate on the uppermost stair and a plurality of wall portions in a staircase region below the uppermost stair; and a plurality of vias extending in a stacking direction of the first insulating film and the first conductive film in the interlayer insulating film under a region between the wall portions and being connected to the first conductive film of each of the stairs.