Patent ID: 8569829

Claim:
A nonvolatile semiconductor memory device comprising: memory strings which have a plurality of transistors including gate electrode films formed on gate dielectric films over sides of columnar semiconductor films in a height direction of the semiconductor films, and which are arranged substantially perpendicularly above a substrate, wherein the memory strings are arranged above the substrate such that memory string groups each having two memory string rows, in which the gate electrode films of the transistors at same height of the memory strings arranged in a first direction are connected, arranged in parallel adjacent to each other in a second direction perpendicular to the first direction are arranged at a predetermined interval in the second direction, and the nonvolatile semiconductor memory device further including a film that is formed between the two memory string rows arranged in parallel adjacent to each other in the second direction in the memory string group to electrically separate between the gate electrode films provided to respectively correspond to the two memory string rows.