To provide The present invention endoscopic treatment tool that can perform the water more accurately. An endoscopic treatment tool 1 includes an insertion portion 10 of the tubular, a stopper 11 provided at the distal end of the insertion portion and has a through-hole 12, advancing and retracting with respect to the insertion portion allow the manipulating wire 20 inserted through the insertion portion, the knife portion 30 of the rod-shaped to be inserted into the through-hole provided at a front end portion of the operation wire, a the insertion portion is provided on the proximal end side than the stopper, and a connecting member 35 for connecting the knife portion 30 and the operation wire, the inner diameter of the through hole is larger than the outer diameter of the knife portion 30, the connection member has a non-penetration shape in the through-hole, the connection In a state of being a member to the stopper, it communicates with a gap formed, and a lumen to allow fluid supply of the insertion portion between the inner surface and the knife portion 30 of the through hole.BACKGROUND 1【課題】送水をより的確に行うことができる内視鏡用処置具を提供する。【解決手段】内視鏡用処置具1は、管状の挿入部10と、貫通孔12を有して挿入部の先端部に設けられたストッパ11と、挿入部に対して進退可能に挿入部に挿通された操作ワイヤ20と、操作ワイヤの先端部に設けられて貫通孔に挿通される棒状のナイフ部30と、挿入部内であってストッパよりも基端側に設けられ、ナイフ部30と操作ワイヤとを接続する接続部材35とを備え、貫通孔の内径は、ナイフ部30の外径よりも大きく、接続部材は、貫通孔内に進入不能な形状を有し、接続部材をストッパにさせた状態において、貫通孔の内面とナイフ部30との間に形成される隙間と、挿入部の内腔とが流体供給可能に連通する。【選択図】図1
