PROBLEM TO BE SOLVED: To provide a valve body for a medical device, which has a liquidtight property to a fluid such as a contrast medium, saline or blood at all times, and is capable of improving the liquidtight property and setting sliding resistance with an insert such as guide wire small, and to provide the medical device and a manufacturing method of the valve body for the medical device.SOLUTION: In a valve body 30 disposed in a body lumen part in a Y connector, at an insertion part 34 of the valve body to which an insert is to be inserted, a cut part 35 having a width extending from the insertion center of the insert to the outer side of a radial direction over the entire length extending from a distal end side to a proximal end side is formed. For at least a partial surface of the inner surface of the cut part 35, the minimum angle θ at which a plane in contact with the partial surface and the axial direction CL of the insertion center cross is set to be 0°<θ<90°.COPYRIGHT: (C)2014,JPO&INPIT【課題】造影剤・生理食塩水あるいは血液等の流体に対する液密性を常に有し、しかも該液密性を高めて、ガイドワイヤのような挿入物との摺動抵抗を小さく設定可能な医療機器用弁体、医療機器、および医療機器用弁体の製造方法を提供する。【解決手段】Yコネクタにおける本体内腔部に配置される弁体30にあって、挿入物が挿入される弁体の挿入部34に、先端側から基端側へと伸びる自身の全長に亘って、挿入物の挿入中心から半径方向の外側へ延びる幅を有する切込部35を形成し、切込部35の内面の少なくとも一部の面は、その一部の面に接する平面と、挿入中心の軸方向CLとの交差する最小角θを、0°<θ<90°に設定した。【選択図】図3
