Patent ID: 7939913

Claim:
A semiconductor device, comprising: a substrate; a layered body formed on the substrate and including a multilayer interconnection structure, the layered body including a plurality of interlayer insulating films stacked in layers, the interlayer insulating films being lower in dielectric constant than a SiO 2 film; a moisture resistant ring extending continuously in the layered body so as to surround a device region where an active element is formed; a protection groove part formed continuously along and outside the moisture resistant ring in the layered body so as to expose a surface of the substrate; a protection film continuously covering an upper surface of the layered body except for an electrode pad on the multilayer interconnection structure, and sidewall surfaces and a bottom surface of the protection groove part; and a film including Si and C as principal components and formed between the protection film and the sidewall surfaces of the protection groove part.