Semiconductor device

A semiconductor device comprising:

• a columnar body;
• a first conductive layer extending like a plate in a first direction intersecting a direction in which the columnar body extends and extending along a first edge portion corresponding to a part of an outer edge of the columnar body;
• a second conductive layer extending like a plate in a second direction intersecting the direction in which the columnar body extends and the first direction and extending along the first edge portion of the columnar body;
• and
• a first memory film arranged in such a manner as to be sandwiched between the first conductive layer and the second conductive layer in the direction in which the columnar body extends in a region along the first edge portion of the columnar body where the first conductive layer and the second conductive layer intersect.

A semiconductor device comprising:

• a stacked film in which layers of different film types are stacked;
• a plurality of memory cells arranged in an array in the stacked film;
• and
• a plurality of walls arranged along a frame of a region surrounded by 2×2 memory cells adjacent to each other on a same plane among the plurality of memory cells, the plurality of walls separating a portion inside the frame and a portion outside the frame in the stacked film.