Patent ID: 8561999

Claim:
A sealing device which is fitted into an annular groove formed in one of a housing with a shaft hole and a shaft inserted into said shaft hole and serves to seal an annular gap between these two members, and which includes a seal ring made of a resin that is in sliding contact with the other of said two members, and an elastic ring that is fitted between said seal ring and said annular groove, wherein: said seal ring has a plurality of concave portions formed on its sliding surface which is in sliding contact with the said other member; and said seal ring has convex portions which are formed so as to enclose said concave portions, respectively, and which rise from said sliding surface and at the same time have initial sliding surfaces, respectively, said sliding surface between said convex portions being relatively higher than said concave portions, said concave portions being formed as separate laterally and circumferentially spaced concave features.