Patent ID: 7398673

Claim:
A gas sensor comprising: a to-be-held member including a distal-end-side holding surface and a proximal-end-side holding surface located on the proximal end side with respect to the distal-end-side holding surface; a tubular metallic shell including a stepped portion projecting radially inward from its inner circumferential surface, and adapted to hold the to-be-held member therein while surrounding the to-be-held member from radially outside and supporting the distal-end-side holding surface of the to-be-held member by a support surface of the stepped portion; and a first metallic packing abutting the proximal-end-side holding surface of the to-be-held member and the inner circumferential surface of the metallic shell, wherein the first packing is disposed in an acute-angle clearance formed between the proximal-end-side holding surface of the to-be-held member and the inner circumferential surface of the metallic shell such that the first packing has a wedge-like cross section and is pressed against the proximal-end-side holding surface of the to-be-held member and the inner circumferential surface of the metallic shell, the inner circumferential surface of the metallic shell includes a tapered surface on the proximal end side with respect to the first packing, the tapered surface having a diameter that increases toward the proximal end side, and the gas sensor further comprises a charged seal layer, which is formed by means of charging a powder into a clearance between the outer circumferential surface of the gas detection element and the inner circumferential surface of the metallic shell including the tapered surface in a region located toward the proximal end of the gas sensor with respect to the first packing.