| 摘要 |
In a hermetically sealing device provided by fitting and mounting a seal member on an annular member, fitting strength between the annular member and the seal member is reduced. A seal member ( 7 ) is provided with a reinforcing ring ( 7 b), a contact part ( 72 ), which is integrally provided with the reinforcing ring ( 7 b) and contacts a first outer circumference skirt part ( 13 a) when it is fitted in the first outer circumference skirt part ( 13 a) of a piston member ( 11 ), and a seal main body ( 7 a) which has a seal lip ( 71 ) which hermetically contacts a circumference plane of a piston inserting hole ( 5 ).
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