PROBLEM TO BE SOLVED: To provide a puncture needle connector configured to easily check a connecting state to a puncture needle and to prevent the connection state from being unintentionally released.SOLUTION: A puncture needle connector 1 includes: an outer cylinder 11； a lumen 1a formed inside the outer cylinder 11； an elastically bending-deformable arm 15 provided on the outer cylinder 11； and a pawl 16 provided on the arm 15. The lumen 1a communicates with the outside via a first opening 21 and a second opening 22. When a puncture needle 210 is inserted into the lumen 1a through the first opening 21, the pawl 16 is engaged with an engaging structure 217 provided integrally with the puncture needle 210, thus forming a liquid-tight seal 25 between the outer peripheral surface of the puncture needle 210 and the inner peripheral surface of the lumen 1a and allowing the puncture needle 210 and the second opening 22 to communicate with each other.SELECTED DRAWING: Figure 10B【課題】穿刺針との接続状態を容易に確認することができ、且つ、当該接続状態が意図せずに解除されるのを防止する。【解決手段】穿刺針用コネクタ１は、外筒１１と、外筒１１内に形成された内腔１ａと、外筒１１に設けられた、弾性的に曲げ変形可能なアーム１５と、アーム１５に設けられた爪１６とを備える。内腔１ａは、第１開口２１及び第２開口２２を介して外界と連通している。第１開口２１を介して穿刺針２１０を内腔１ａに挿入すると、爪１６が穿刺針２１０に一体的に設けられた係合構造２１７に係合し、穿刺針２１０の外周面と内腔１ａの内周面との間に液密なシール２５が形成され、且つ、穿刺針２１０と第２開口２２とが連通する。【選択図】図１０Ｂ
