An epoch-making highly slidable syringe having high safety and sealing performance over a long period of time and having low sliding resistance with respect to the syringe barrel of the gasket is obtained. The highly slidable syringe A includes a syringe barrel 1, a gasket 10 that is press-fitted into the syringe barrel 1 and used in a sliding state in the syringe barrel 1, and a piston rod 5 to which the gasket 10 is attached at the tip. Is done. The gasket 10 is made of a hard plastic having chemical resistance against the chemical solution 30 filled in the syringe barrel 1, and the gasket main body has a groove 18 formed in the sliding contact surface 11 with the inner peripheral surface 2 of the syringe barrel 1. 26 and a sliding contact ring 19 fitted in the concave groove 18. The sliding contact ring 19 is composed of a rubber base material (elastomer) 19c in which the filled silicone oil bleeds, and the silicone oil filled in the rubber base material 19c, and the outer diameter D1 thereof is the syringe barrel 1. It is formed larger than the inner diameter D0. The outer diameter D2 of the liquid contact side sliding contact surface 11a provided between the liquid contact end surface 14 of the gasket body 26 and the groove 18 is formed larger than the inner diameter D0 of the syringe barrel 1, and the rod side of the gasket body 26 is The outer diameter D3 of the rod side sliding contact surface 11b provided between the end surface 17a and the concave groove 18 is formed to be equal to or smaller than the inner diameter D0 of the syringe barrel 1.長期にわたって安全性や密封性が高く、しかもガスケットのシリンジバレルに対する摺動抵抗が小さい画期的な高摺動性シリンジを得る。 高摺動性シリンジＡは、シリンジバレル１と、シリンジバレル１に圧入され、シリンジバレル１内を摺動状態で用いられるガスケット１０と、前記ガスケット１０が先端に装着されるピストンロッド５とで構成される。ガスケット１０は、シリンジバレル１に充填される薬液３０に対して耐薬液性を有する硬質プラスチック製で、シリンジバレル１の内周面２との摺接面１１に凹溝１８が形成されたガスケット本体２６と、前記凹溝１８に嵌め込まれた摺接リング１９とで構成される。摺接リング１９は、充填されたシリコーンオイルがブリードするゴム基材（エラストマ）１９ｃと、前記ゴム基材１９ｃに充填された前記シリコーンオイルとで構成され、且つ、その外径Ｄ１はシリンジバレル１の内径Ｄ０より大きく形成される。ガスケット本体２６の接液側端面１４と凹溝１８との間に設け
