Patent ID: 8338876

Claim:
A non-volatile semiconductor storage device comprising: a plurality of memory strings each having a plurality of electrically rewritable memory cells connected in series, each of the memory strings comprising: a first semiconductor layer including a columnar portion extending in a vertical direction with respect to a substrate; a plurality of first conductive layers formed to surround side surfaces of the columnar portions via insulation layers, and formed at a certain pitch in the vertical direction, the first conductive layers functioning as floating gates of the memory cells, and including an insulation film between the plurality of first conductive layers; and a plurality of second conductive layers formed to surround the first conductive layers via insulation layers, and functioning as control electrodes of the memory cells, each of the first conductive layers having a length in a longitudinal direction of the first semiconductor layer, that is shorter than a length of each of the second conductive layers in the longitudinal direction of the first semiconductor layer, and the shorter length portion of the first conductor layer being surrounded by the greater length portion of the second conductor layer.