Patent ID: 8361862

Claim:
A method for manufacturing a nonvolatile semiconductor memory device, the device including a stacked structural unit including a plurality of insulating films alternately stacked with a plurality of electrode films in a first direction and a semiconductor pillar piercing the stacked structural unit in the first direction, the method comprising: forming a stacked unit including a core material film alternately stacked with a sacrificial film on a major surface of a substrate perpendicular to the first direction; making a trench in the stacked unit, the trench extending in the first direction and a second direction in a plane perpendicular to the first direction; filling a filling material into the trench; removing the sacrificial film to form a hollow structural unit, the hollow structural unit including a post unit supporting the core material film on the substrate, the post unit being made of the filling material; and forming the stacked structural unit by stacking one of the insulating films and one of the electrode films on a surface of the core material film exposed by removing the sacrificial film, wherein spacing between the core material films increases as a distance from the post unit increases.