To provide cost reduction such as reduction of assembly manhours and reduction of the number of parts without deteriorating pressure tightness and durability.

The seal for an absorber sealing an annular gap between a housing and a reciprocating shaft assembled to mutually and concentrically reciprocate, comprises: an oil seal equipped with an oil lip integrally provided in an inner peripheral side of a first annular member held in a housing side and contacting so as to carry out sealing an outer peripheral surface of the reciprocating shaft; and a dust seal equipped with a dust lip positioned in an outer side than the oil seal, integrally provided in an inner peripheral side of a second annular member held in a housing side, and contacting so as to carry out sealing the outer peripheral surface of the reciprocating shaft. An inner peripheral part side of the second annular member provides a backup means for the oil lip.