Medical connectors pertaining to the present disclosure includeA flow tube portion that can be inserted into an insertion opening of a locking female connector conforming to ISO 80399-7 andCovers the radial circumference of the channel tubeA connection tube portion having a female screw portion threaded to the tip flange of the female connector andIn the connection tube sectionAn elastic valve body capable of changing a shape between a closed form for covering an opening at the distal end side of the flow path of the flow tube tube and an open form for opening the openingEquipped withThe above described female screw partIt is provided with a valley portion in which the tip flange is sandwiched in contact with the tip flange of the female connector in contact with the edge of the insertion opening of the female connector.本開示に係る医療用コネクタは、ＩＳＯ８０３６９－７に準拠するロック式のメスコネクタの挿入開口に挿入可能な流路管部と、前記流路管部の径方向の周囲を覆い、前記メスコネクタの先端フランジに螺合可能な雌ねじ部を備える接続筒部と、前記接続筒部内において、前記流路管部の流路の遠位端側の開口を覆う閉鎖形態と前記開口を開放する開放形態との間で形態を変化可能な弾性弁体と、を備え、前記雌ねじ部は、前記先端フランジと螺合し前記弾性弁体を前記メスコネクタの前記挿入開口の縁部に当接させた当接状態で前記先端フランジを挟み込む谷部を備える。
