PROBLEM TO BE SOLVED: To provide a fixing tool capable of stably fixing a medical instrument to a tissue while protecting a thinned incisal portion of the tissue due to an incision.SOLUTION: A fixing tool 1 comprises: a cylindrical body 2 that allows insertion of a medical instrument 50 and is attached on an outer peripheral surface of the medical instrument 50 and two holding members 3 and 4 that are arranged on an outer peripheral surface of the body 2 at intervals in a longitudinal direction and hold a tissue by pinching it in the longitudinal direction. The holding members 3 and 4 respectively include a contact section 7 capable of relatively moving in the longitudinal direction between a position of contacting in the longitudinal direction and a mutually separating position, and these contact sections 7 contact each other at a position outwardly apart in a radial direction from the outer peripheral surface of the body.COPYRIGHT: (C)2014,JPO&INPIT【課題】切開によって脆くなった組織の切縁部分を保護しつつ組織に医療器具を安定して固定することができる。【解決手段】医療器具50が挿入され該医療器具50の外周面に取り付けられる筒状の本体2と、該本体2の外周面に長手方向に間隔を空けて配置され、組織を長手方向に挟んで把持する2つの把持部材3,4とを備え、該2つの把持部材3,4が、長手方向に接触する位置と互いに離間した位置との間で長手方向に相対移動可能な接触部7を各々有し、これら接触部7が、本体の外周面から半径方向外方に間隔を空けた位置において互いに長手方向に接触する固定具1を提供する。【選択図】図2