PROBLEM TO BE SOLVED: To provide an indwelling needle assembly with a new structure in which an inner needle can be pulled out of an outer needle stably.SOLUTION: An indwelling needle assembly 10 in which an inner needle 18 having an inner needle hub 20 on the base end side is inserted into an outer needle 24 having an outer needle hub 26 on the base end side, the inner needle 18 being mounted with a needle tip protector member 22 so as to be moved in a lengthwise direction, includes a regulation part 126 for regulating the movement of the needle tip protector member 22 to the base end side with respect to the outer needle hub 26, a finger placing part 116 exposed to the outside, and an insertion part 110 inserted into a base end side opening 52 of the outer needle hub 26 and extends to the tip side along an inner peripheral surface 49 of a peripheral wall part 46 of the outer needle hub 26 located on a side radially opposite to the finger placing part 116, all of which are integrally provided.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】外針から内針を安定して引き抜くことができる、新規な構造の留置針組立体を提供する。【解決手段】外針ハブ26を基端側に有する外針24に対して、内針ハブ20を基端側に有する内針18が挿通されていると共に、該内針18には長さ方向に移動可能に針先プロテクタ部材22が装着された留置針組立体10において、前記針先プロテクタ部材22の前記外針ハブ26に対する基端側への移動を規制する規制部126と、外部に露出する指置部116と、該外針ハブ26の基端側開口部52に挿入されて該指置部116とは径方向反対側に位置する該外針ハブ26の周壁部46の内周面49に沿って先端側に延びる挿入部110とが、一体的に設けられている。【選択図】図3
