PROBLEM TO BE SOLVED: To provide an improved endoscopic treatment instrument having higher operability.SOLUTION: The treatment instrument for the endoscope includes: a casing holding portion 86 that is provided at a distal end of an insertion portion to be inserted into a body and that holds a casing 150 connected to a tip member by a thread 125, the casing containing the tip member 121 detachably attached to one of a pair of forceps members after being passed through a tissue in response to a closing motion of the pair of forceps members 115, 131 at least one of which is pivoted openably and closably with respect to the other forceps member a casing locking member 205 which engages the casing holding portion and the casing together and a guide member 210 that is provided at the tip cover 80 and that controls an engagement state made by the casing locking member between the casing holding portion and the casing.COPYRIGHT: (C)2012,JPO&INPIT【課題】より操作性の向上した内視鏡用処置具を提供する。【解決手段】内視鏡用処置具は、体内に挿入される挿入部の先端に設けられ、少なくとも一方が他方に対して開閉自在に枢支された一対の鉗子部材115、131の閉動作に伴って、一対の鉗子部材の一方に着脱自在に装着される先端部材121を組織に通した後に収容し、先端部材と糸125で繋がれているケーシング150を保持するケーシング保持部86と、ケーシング保持部と、ケーシングとを係合させるケーシング係止部材205と、先端カバー80に設けられ、ケーシング係止部材によるケーシング保持部とケーシングとの係合状態を制御するガイド部材210と、を含む。【選択図】図9
