Patent ID: 8048798

Claim:
A method for manufacturing a nonvolatile semiconductor storage device, comprising: forming a first insulating layer; forming a first conductive layer on the first insulating layer; forming a second insulating layer on the first conductive layer; forming a first hole so that it penetrates the first insulating layer, the first conductive layer, and the second insulating layer; forming a first side wall insulating layer on a side wall of the first hole; forming a sacrificing layer so that the sacrificing layer fills in the first hole; forming a third insulating layer on an upper layer of the sacrificing layer; forming a second conductive layer on the third insulating layer; forming a fourth insulating layer on the second conductive layer; forming a second hole on a position which matches with the first hole so that the second hole penetrates the third insulating layer, the second conductive layer, and the fourth insulating layer; forming a second side wall insulating layer on a side wall of the second hole; removing the sacrificing layer after the formation of the second side wall insulating layer; and forming a semiconductor layer so that the semiconductor layer fills in the first hole and the second hole after the removal of the sacrificing layer.