What is claimed is:

　　1. A spiral wound gasket for an exhaust pipe connection, which is formed into a spiral, said spiral wound gasket comprising: a gasket body comprising a metal hoop material overlapped with filler material; and an annular metal body comprising a metal hoop material, said annular metal body serving as a centering member integrally disposed at an inner periphery side of the gasket body, said annular metal body having a convex section which extends radially inwardly from the inner periphery side of the gasket body, said annular metal body defining an annular closed space with the inner periphery side of the gasket body.

　　2. The spiral wound gasket according to claim 1, wherein the metal hoop material has a corrugated section, wherein the gasket body defines generally flat outer surfaces, and wherein the convex section of said annular metal body is V-shaped with cut open ends which are diametrically outwardly directed and both abutting each other in the gasket body at the inner periphery side of the gasket body such that said annular metal body comes in contact with the inner periphery side of the gasket body and such that the distance from each of said generally flat outer surfaces to said annular metal body is equal, said annular metal body being made in a unitary structure with said gasket body.

　　3. The spiral wound gasket according to claim 1, wherein the gasket body defines generally flat outer surfaces, wherein the convex section of said annular metal body is U-shaped, wherein the metal hoop material has a corrugated section, wherein said annular metal body comes in contact with the inner periphery side of the gasket body such that the distance from each of said generally flat surfaces to said annular metal body is equal and wherein the metal hoop material of the annular metal body and the gasket body are integrally molded in a continuous manner.