Patent ID: 8436414

Claim:
A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a stacked body provided on the semiconductor substrate, the stacked body having electrode films and insulating films being alternately stacked; a first semiconductor pillar and a second semiconductor pillar provided inside a first through hole penetrating through the stacked body in a stacking direction of the stacked body, the first through hole having a first cross section of a first oblate circle, the first cross section being cut in a direction perpendicular to the stacking direction, the first semiconductor pillar facing the second semiconductor pillar in a first major axis direction of the first oblate circle, the first semiconductor pillar and the second semiconductor pillar extending in the stacking direction; a first charge storage layer provided between the electrode films and the first semiconductor pillar; and a second charge storage layer provided between the electrode films and the second semiconductor pillar, a length of the first through hole in the first major axis direction being not less than 1.5 times and less than 3.0 times a length of the first through hole along a minor axis direction orthogonal to the first major axis direction.