PROBLEM TO BE SOLVED: To provide a medical device capable of simply performing formation of a sheet-like member.SOLUTION: A medical device for inserting a sheet-like member S into the body comprises: a cylindrical member an operating rod to be inserted into the cylindrical member movably in the axial direction and rotatably around the axis, the operating rod having a holding part for holding the sheet-like member at the tip side along the axial direction of the operating rod and a winding member for taking up the sheet-like member. In the winding member is formed a hole at least one end of which opens in a surface of the winding member and an inner diameter of which is equal to or less than that of the cylindrical member. Also in the winding member is formed a slit which extends along an axis direction of the hole from the surface in which the one end of the hole opens, and which communicates with the hole.COPYRIGHT: (C)2016,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