endoscopic treatment instrument, the puncture section has a tip portion and a side hole to the lumen communicates provided on an outer peripheral surface of the puncture, flexible elongated having a a needle tube which is formed, is accommodated within said lumen, and a collection member having a cup portion which opens radially outward of the needle tube is connected to the collecting member, which is movably inserted into the needle tube comprising operating a member, when moving the operating member relative to the needle tube, wherein the cup portion projects from the side hole.内視鏡用処置具は、穿刺部と、前記穿刺部の外周面に設けられて内腔と連通する側孔とを先端部に有し、可撓性を有して長尺に形成された針管と、前記内腔内に収容され、前記針管の径方向外側に向かって開口するカップ部を有する採取部材と、前記採取部材に接続され、前記針管内に進退可能に挿通された操作部材と、を備え、前記操作部材を前記針管に対して移動させると、前記カップ部が前記側孔から突出する。
