PROBLEM TO BE SOLVED: To provide a medical valve having a novel structure in which damage of an elastic valve body due to insertion of a needleless type male connector is reduced. SOLUTION: A port 14 for connecting a male connector to which a disc-shaped elastic valve body 16 is mounted is provided, and an inner locking groove 26 and an outer locking groove formed on an outer peripheral portion of the elastic valve body 16. In the medical valve 10 in which the inner claw portion 62 and the outer claw portion 78 formed in the housing 12 are supported by being locked with respect to the outer side 28, the outer side claw which is superposed on the outer side engaging groove 28 of the elastic valve body 16. At the axially outer end portion of the inner peripheral surface 78a of the portion 78, a cylindrical inner periphery having an inner diameter dimension of 3.9 to 4.5 mm and an axial length of 1/3 or more of the outer claw portion. The inner diameter of the inner peripheral surface 64c of the inner claw portion 62, which is formed with the surface 81 and is overlapped with the inner locking groove 26 of the elastic valve body 16, is equal to the inner diameter of the cylindrical inner peripheral surface 81 of the outer claw portion 78. It is larger than the size. [Selection diagram] Figure 1【課題】ニードルレスタイプの雄コネクタの挿入に伴う弾性弁体の損傷が軽減される、新規な構造の医療用弁を提供する。【解決手段】ディスク状の弾性弁体１６が装着された雄コネクタ接続用のポート１４が設けられていると共に、弾性弁体１６の外周部分に形成された内側係止溝２６と外側係止溝２８に対してハウジング１２に形成された内側爪部６２と外側爪部７８が係止されて支持されている医療用弁１０において、弾性弁体１６の外側係止溝２８に重ね合わされた外側爪部７８の内周面７８ａにおける軸方向外方端部分には、内径寸法が３．９～４．５ｍｍで且つ軸方向長さが該外側爪部の１／３以上とされた筒状内周面８１が形成されていると共に、弾性弁体１６の内側係止溝２６に重ね合わされた内側爪部６２の内周面６４ｃの内径寸法が、外側爪部７８における筒状内周面８１の内径寸法よりも大きくされている。【選択図】図１
