Patent ID: 8426908

Claim:
A nonvolatile semiconductor memory device including a first region having a plurality of electrically rewritable memory cells disposed therein, and a second region adjacent to the first region, the nonvolatile semiconductor memory device comprising: a plurality of first conductive layers stacked in the first region and the second region and functioning as control electrodes of the memory cells in the first region, the plurality of first conductive layers including a stepped portion in the second region, positions of ends of the plurality of first conductive layers being different in the stepped portion; a semiconductor layer surrounded by the first conductive layers in the first region, including a first columnar portion extending in a stacking direction, and functioning as a body of the memory cells; a charge storage layer formed between the first conductive layers and a side surface of the first columnar portion and configured to enable storage of a charge and thereby retain data of the memory cells; and an insulating columnar layer surrounded by the first conductive layers in the stepped portion, and including a second columnar portion extending in the stacking direction and comprising an insulator.