Patent ID: 8169016

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 conductive layers stacked in the first region and the second region and functioning as control electrodes of the memory cells in the first region; a semiconductor layer surrounded by the conductive layers in the first region, including a columnar portion extending in a perpendicular direction with respect to a substrate, and functioning as a body of the memory cells; and a charge storage layer formed between the conductive layers and a side surface of the columnar portion and configured to enable storage of a charge and thereby retain data of the memory cells, the conductive layers comprising: a plurality of first trenches arranged in the first region so as to have a first pitch in a first direction, the first trenches being formed in stripes having a second direction as a longitudinal direction, the second direction being perpendicular to the first direction, and the first trenches being formed penetrating the plurality of conductive layers; a plurality of second trenches arranged in the second region so as to have a second pitch in the first direction, the second trenches being formed in stripes having the second direction as a longitudinal direction, and the second trenches being formed penetrating the plurality of conductive layers; and a plurality of third trenches arranged in the second region so as to have a third pitch in the first direction and so as to be sandwiched by the second trenches, the third trenches being formed in stripes having the second direction as a longitudinal direction, and the third trenches being formed penetrating the plurality of conductive layers.