Disclosed is an annular elastic gasket (1) disposed between an insertion hole (20a) formed in a housing (20) and a cylindrical body (30) inserted into the housing (20) via the insertion hole (20a) while the annular elastic gasket is elastically in contact with the inner wall of the insertion hole (20a) and the outer periphery of the cylindrical body (30). The annular elastic gasket composed of an elastic mold is comprised of a hollow cylindrical gasket base body (2) which is press-fitted and retained in the insertion hole (20a); an annular seal lip (3) extending from the gasket base body (2) toward the center of the annular elastic gasket; and an elastically coupled portion (4) having a coupled base portion (4a) which functions as the tip of a tip-side portion (3a) of the annular seal lip portion (3) and which is bent toward the center. When the cylindrical body (30) is inserted, the elastically coupled portion (4) is expanded together with the tip-side portion (3a), and is elastically attached to the outer periphery of the cylindrical body (30) while maintaining the elastic restoring force.
