Patent ID: 8440528

Claim:
A method for manufacturing a nonvolatile semiconductor memory device comprising: forming a stacked body by alternately stacking a plurality of interlayer insulating films and a plurality of control gate electrodes; forming a through-hole extending in a stacking direction in the stacked body; etching a portion of the interlayer insulating films facing the through-hole via the through-hole to remove the portion; forming a first insulating film on inner faces of the through-hole and the portion in which the interlayer insulating films are removed; forming a floating gate electrode made of conductive material on the first insulating film in the portion in which the interlayer insulating film is removed; forming a second insulating film so as to cover a portion of the floating gate electrode facing the through-hole; and burying a semiconductor pillar in the through-hole, wherein wet etching is performed as the etching.