PROBLEM TO BE SOLVED: To provide a treatment tool for a basket type endoscope, hardly causing incarceration when crushing a calculus, and capable of safely removing incarceration when incarceration occurs.SOLUTION: A treatment tool 1 for a basket type endoscope includes: a small inner diameter region (a) which has a prescribed inner diameter and allows an inner diameter part of a tip chip 6 to collect basket wires 41,42 in an axial direction and hold them； and a large inner diameter region (b) which is positioned at a rear end side with respect to the small inner diameter region (a), has an inner diameter larger than that of the small inner diameter region (a), and makes the basket wires movable in the inside.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2019,JPO&INPIT【課題】結石を破砕する際に嵌頓しにくく、嵌頓した場合であっても嵌頓を安全に解除できるバスケット型内視鏡用処置具を提供すること。【解決手段】先端チップ６の内径部が、軸方向に、バスケットワイヤ４１、４２を纏めて保持するための所定内径の細内径領域イと、該細内径領域イよりも後端側に位置し、前記細内径領域イより内径が大きく前記バスケットワイヤが内部で移動可能な太内径領域ロとを有するバスケット型内視鏡用処置具１。【選択図】 図２
