PROBLEM TO BE SOLVED: To provide a medical instrument capable of simply molding a sheet-like member.SOLUTION: The medical instrument for inserting a sheet-like member into a body, includes: a cylindrical member an operating rod inserted into the cylindrical member so that it is movable in the axial direction and rotatable around the axis, and having a holding part for holding the sheet-like member on its distal end side so that it lies along the axial direction of the operating rod and a winding member for winding the sheet-like member. In the winding member, a hole in which at least one end is opened in the surface of the winding member, and the inner diameter of which is at most the inner diameter of the cylindrical member, is formed, and a slit in which one end of the hole extends along the axial direction of the hole from the opening face and which is communicated with the hole, is formed.COPYRIGHT: (C)2013,JPO&INPIT【課題】シート状部材の成形を簡易に行うことができる医療器具を提供する。【解決手段】シート状部材を体内に挿入するための医療器具であって、筒状部材と、軸方向に移動可能且つ軸周りに回転可能に筒状部材内に挿入される操作ロッドであって、当該操作ロッドの軸方向に沿うようシート状部材を保持する保持部を先端側に有する操作ロッドと、シート状部材を巻き取るための巻取部材と、を備え、巻取部材は、少なくとも一方端が当該巻取部材の表面に開口し且つ内径が筒状部材の内径以下の孔が形成されるとともに、孔の一方端が開口する面から孔の軸方向に沿って延びるとともに孔と連通するスリットが形成されている。【選択図】図1