Patent ID: 8791464

Claim:
A nonvolatile semiconductor memory device comprising: a stacked structure including a plurality of electrode films and a plurality of interelectrode insulating films alternately stacked in a first direction; a semiconductor pillar piercing the stacked structure in the first direction; a memory layer provided between each of the electrode films and the semiconductor pillar; an inner insulating film provided between the memory layer and the semiconductor pillar; and an outer insulating film provided between each of the electrode films and the memory layer, the device including a first region and a second region, the first region including a first electrode film being one of the electrode films, the second region including a second electrode film being an other of the electrode films, an outer diameter of the outer insulating film along a second direction perpendicular to the first direction in the first region being larger than an outer diameter of the outer insulating film along the second direction in the second region, a thickness of the outer insulating film along the second direction changing at a region between the first region and the second region, and a first thickness of the outer insulating film along the second direction in the first region being thicker than a second thickness of the outer insulating film along the second direction in the second region, the first thickness being a thickness in all of a region between the semiconductor pillar and the first electrode film, and the second thickness being a thickness in all of a region between the semiconductor pillar and the second electrode film located in the second region.