In the medical connector of the present invention, the housing includes a valve body housing portion that has a cylindrical inner peripheral surface that is continuous with the cylindrical male connector connection port and has a diameter larger than that of the male connector connection port. The head includes slits that can be opened on the upper surface and the outer peripheral surface of the head, and in a natural state in which no radial compressive force is applied, a first width that is a width in a direction perpendicular to the slits is The body of the valve body has a cylindrical outer peripheral surface having an outer diameter that substantially matches the inner diameter of the inner peripheral surface of the valve body housing portion. It is characterized by that.本発明の医療用コネクタは、ハウジングが、円筒状のオスコネクタ接続口に連なると共に該オスコネクタ接続口よりも拡径された円筒状の内周面を有する弁体収容部を備え、弁体の頭部は、該頭部の上面及び外周面に開口可能なスリットを備えると共に、径方向への圧縮力が付与されていない自然状態において、前記スリットと直交する方向の幅である第１幅が、前記スリットに沿う方向の幅である第２幅よりも大きく、前記弁体の胴部は、前記弁体収容部の内周面の内径と略一致する外径の円筒状の外周面を有していることを特徴とする。
