Patent ID: 7714413

Claim:
A semiconductor device, comprising: a semiconductor integrated circuit provided on a semiconductor substrate; multilevel wiring layers that are formed on the semiconductor substrate and are provided above a region where a circuit is formed; and a seal ring provided so as to surround the periphery of said region and said multilevel wiring layers, wherein the multilevel wiring layers include a plurality of first wiring layers and a plurality of second wiring layers, each of the first wiring layers including a first interlayer insulating film, each of the second wiring layers including a second interlayer insulating film, and a plurality of the second wiring layers formed over a plurality of the first wiring layers, the seal ring includes a plurality of first seal rings and a plurality of second seal rings, each of the first seal rings is formed in the first interlayer insulating film, each of the second seal rings is formed in the second interlayer insulating layer, and the plurality of the second seal rings are formed above a plurality of the first seal rings, a first cross sectional form of each of the first seal rings is a predetermined shape, a second cross sectional form of each of the second seal rings is rectangular, a first relative dielectric constant of each of said first interlayer insulating films is smaller than 3.5, and a second relative dielectric constant of each of said second interlayer insulating films is no less than 3.5, the seal ring of which a cross sectional form is not rectangular is formed in the first insulating film, the predetermined shape has a leg portion and a seal portion arranged above the leg portion, a first width of the leg portion is narrower than a second width of the seal portion, each of the plurality of second seal rings penetrates a respective of the second interlayer insulating films, each of the plurality of second seal rings includes a copper metal and a barrier metal formed on a side wall of the copper metal and on a bottom of the copper metal, a plurality of second wirings are formed such that each second wiring is formed in a respective of the second interlayer insulating films just beside a respective of the second seal rings, and a contact portion connects between two adjacent of the second wirings, the contact portion formed just beside the respective of the second seal rings.