The chemical liquid administration system (10) comprises a chemical liquid supply device (12) and a feeder (14).The chemical liquid feeding device (12) comprises a housing (18) containing a cylindrical body (16) and having a guide tube (22), a sealing member (24), and a fixing member (26) for fixing the sealing member (24).The connector 30 of the feeder 14 has a connector body 34 which can be fitted into the guide tube 22.The connector body (34) has a guide receiving portion (40a) substantially concentrically arranged with the needle tube (36) and an engaging portion (54) capable of engaging with the fixing member (26) in accordance with the axial displacement relative to the distal end (16d).薬液投与システム（１０）は、薬液投与装置（１２）と投与器具（１４）とを備える。薬液投与装置（１２）は、筒体（１６）を収容し且つガイド筒部（２２）を有するハウジング（１８）と、封止部材（２４）と、封止部材（２４）を固定する固定部材（２６）とを備える。投与器具（１４）のコネクタ（３０）は、ガイド筒部（２２）に嵌合可能なコネクタ本体（３４）を有する。コネクタ本体（３４）は、針管（３６）と略同心的に配置されたガイド受筒部（４０ａ）と、先端筒部（１６ｄ）に対する軸方向への相対変位に伴って固定部材（２６）に係合可能な係合部（５４）を有する。
