Patent ID: 7777341

Claim:
A semiconductor device comprising: a semiconductor substrate; a multilayer interconnect structure having a first insulating film and a second insulating film formed in this order on said semiconductor substrate, and interconnects respectively formed in said first insulating film and said second insulating film; a seal ring formed on an outer circumference of an element forming region when seen from the top in said multilayer interconnect structure; a first dummy metal structure formed in said first insulating layer and formed on an outer circumference of said seal ring when seen from the top; a second dummy metal structure formed in said second insulating layer and formed between said first dummy metal structure and said seal ring when seen from the top; wherein said first dummy metal structure and said second dummy metal structure are arranged adjacent to each other and not to overlap when seen from the top; the upper surface of said first dummy metal structure is arranged at a level equal to or higher than the level of the lower surface of said second dummy metal structure; and wherein the each of the first and second dummy metal structures has a trapezoid-shaped section where the length of the upper side thereof is shorter than that of the lower side or the length of the upper side thereof is longer than that of the lower side.