Prefilled syringe outer cylinder for (2) is provided with a hollow needle (61) having a needle at both ends, a hollow needle (61) is mounted, and the piercing member body (60) having piercing member-side engaging part (62) piercing member comprising bets (6) is capable mounted. Prefilled syringe outer cylinder for (2) seals the opening (48) the outer tube body with the tip portion (41) having (4), the distal end portion of the opening (48) in (41), and a hollow needle needle portion (61) (61b) is housed a sealing member (10) capable of piercing, and the outer cylinder body (4) outer cylindrical sealing member attached to the distal end (41) of (5) provided with a door. Outer tubular sealing member (5) is penetrating member mounting portion capable of mounting the piercing member (6) and (50), withdrawal and times of the outer cylindrical sealing member attached to the outer cylinder body (4) (5) and a regulating portion for regulating the movement. Further, the outer tube sealing member (5), from the outer tube (2) outer cylindrical sealing member (5) side, by pushing the piercing member (6) in the piercing member-side engaging portion (62) It has outer cylindrical sealing member side engagement portion for engaging (53).プレフィルドシリンジ用外筒(2)は、両端に針部を有する中空針(61)と、中空針(61)を装着し、かつ穿刺部材側係合部(62)を有する穿刺部材本体(60)とを備える穿刺部材(6)が装着可能なものである。プレフィルドシリンジ用外筒(2)は、開口(48)を有する先端部(41)を備えた外筒本体(4)と、先端部(41)の開口(48)を封止し、かつ、中空針(61)の針部(61b)が刺通可能なシール部材(10)を収納し、かつ、外筒本体(4)の先端部(41)に装着された外筒封止部材(5)とを備える。外筒封止部材(5)は、穿刺部材(6)を装着可能な穿刺部材装着部(50)と、外筒本体(4)に装着された外筒封止部材(5)の離脱および回動を規制する規制部とを有する。さらに、外筒封止部材(5)は、外筒(2)を外筒封止部材(5)側より、穿刺部材(6)内に押し込むことにより、穿刺部材側係合部(62)と係合する外筒封止部材側係合部(53)を有している。
