Patent ID: 8872304

Claim:
A semiconductor device comprising: a first interlayer insulating layer comprising a first side face and a second side face; a plurality of wirings provided in the first interlayer insulating layer; an air gap made between at least one pair of the wirings in the first interlayer insulating layer; and a second interlayer insulating layer provided over the wirings and the first interlayer insulating layer with a first bottom face thereof exposed to the air gap, wherein the pair of adjacent wirings having a shortest distance there between are first wirings, the first wirings having side faces and upper faces, wherein the first side face of the first interlayer insulating layer is in contact with each of the first wirings; wherein the second side face of the first interlayer insulating layer is exposed to the air gap and is in contact with a bottom face of the air gap, wherein the first side face of the first interlayer insulating layer forms a first angle with one of the side faces of the first wirings, and the second side face of the first interlayer insulating layer forms a second angle with a plane parallel to the one of the side faces of the first wirings, and wherein the first angle is larger than the second angle.