Patent ID: 8575587

Claim:
A storage device comprising: a plurality of A-wirings; a plurality of B-wirings crossing the A-wirings; a first via plug formed between a first B-wiring and two adjacent A-wirings consisting of a first A-wiring and a second A-wiring, a maximum diameter of the first via plug at a bottom surface, which is facing the A-wirings in a direction vertical to an extending direction of the A-wirings, is smaller than a length corresponding to a pitch of the A-wirings plus a width of the A-wirings; a first storage element formed between the first via plug and the first A-wiring; a second storage element formed between the first via plug and the second A-wiring; a second via plug formed between a second B-wiring adjacent to the first B-wiring and two adjacent A-wirings consisting of the second A-wiring and a third A-wiring, a maximum diameter of the second via plug at a bottom surface, which is facing the A-wirings in a direction vertical to the extending direction of the A-wirings, is smaller than the length corresponding to the pitch of the A-wirings plus the width of the A-wirings; a third storage element formed between the second via plug and the second A-wiring; and a fourth storage element formed between the second via plug and the third A-wiring.