Patent ID: 8579298

Claim:
A sealing device for sealing an annular gap between two members reciprocating with respect to each other, comprising: a seal body including a seal lip extending toward a sealed fluid side and toward one of the two members to come in contact with a surface of the one member to be able to slide is provided, a plurality of annular grooves are provided to a first inclined face of the seal lip on an opposite side from the sealed fluid side at intervals from the sealed fluid side toward the opposite side, curved faces are formed between a side face on the sealed fluid side and the first inclined face and between a side face on an opposite side from the sealed fluid side and the first inclined face in each of the annular grooves, a curved face is formed between a second inclined face on the sealed fluid side at a tip end of the seal lip and the first inclined face, and in a section passing through a central axis of the annular sealing device, a radius of curvature of the curved face between the first inclined face and the second inclined face is larger than a radius of curvature of the curved face between the side face on the opposite side from the sealed fluid side and the first inclined face in each of the plurality of annular grooves and is smaller than a radius of curvature of the curved face between the side face on the sealed fluid side and the first inclined face in each of the plurality of annular grooves.