Patent ID: 8294199

Claim:
A nonvolatile semiconductor memory device comprising: a first stacked structure body including a plurality of first electrode films and a plurality of first inter-electrode insulating films alternately stacked in a first direction; a second stacked structure body aligned with the first stacked structure body in a direction perpendicular to the first direction and including a plurality of second electrode films and a plurality of second inter-electrode insulating films alternately stacked in the first direction; a first semiconductor pillar piercing the first stacked structure body along the first direction; a second semiconductor pillar piercing the second stacked structure body along the first direction and aligned with the first semiconductor pillar along a second direction perpendicular to the first direction; a first memory unit provided between the plurality of first electrode films and the first semiconductor pillar; a second memory unit provided between the plurality of second electrode films and the second semiconductor pillar; and a semiconductor connection portion connecting one end of the first semiconductor pillar and one end of the second semiconductor pillar, the semiconductor connection portion including: an end connection portion having a connection portion side face along the second direction; and a first protrusion protruding at the connection portion side face in a direction intersecting with the first direction and having a side face continuous with a side face of the first semiconductor pillar along the first direction, and the semiconductor connection portion not including a portion smaller than a diameter of the first semiconductor pillar.