. The pillars 00 arranged in a matrix configuration are formed because the portion of the unit stacked body 00 of the first level from the stopper layer 00 to the upper portion 00b of the bit line member 00 already is divided by the trenches 00. On the other hand, the lower portion 00a of the bit line member 00 is not divided by the trenches 00 and forms interconnects extending in the 