Patent ID: 8714563

Claim:
An annular elastic gasket adapted to be disposed between an insertion hole formed in a housing and a cylindrical body which is inserted into said housing via said insertion hole in such a manner that said annular elastic gasket elastically contacts an inner surface of said insertion hole and an outer circumferential surface of said cylindrical body, said annular elastic gasket comprising: a hollow cylindrical gasket base body comprised of a molded body made of an elastic material; an annular seal lip portion extending in the centripetal direction from one end of said gasket base body; and an annular elastic extending portion further extending from an end of a tip side portion of said annular seal lip portion in the centripetal direction, wherein: said annular seal lip portion is to tapered so as to gradually narrow the diameter in the centripetal direction from said one end to the other end of said gasket body; and said gasket is held in said insertion hole of said housing in a compressed condition in such a manner that said one end from which said annular seal lip portion of said gasket body extends is positioned inside, and said elastic extending portion elastically expands in the diametrical direction together with said tip side portion of said annular seal lip portion, thereby said elastic extending portion elastically contacts said outer circumferential surface of said cylindrical body while maintaining elastic restoring force in the contracting direction.