While guaranteeing the adherence strength of the needle, it offers the medical application connector which assuring the further small diameter conversion of the connector opening it is possible, is improved. As annulation binds condition section 58 is provided by forming circular sulcus 54,56 in internal both sides 50,52 of the rim part of elastic needle 38, although binds rim side than condition section 58 is designated as annular fixed part 46 as valve receiving seat 68 is formed in the inner circumference edge of opening 65 of housing 12, locking annular ring 42 in opening 65, putting annular fixed part 46 with these valve receiving seats, 68 and annular ring 42 the person in charge stopping projected part 70,80 which it supported, furthermore, valve receiving seat it formed on the opposed face of 68 and annular ring 42The person in charge making circular sulcus stop 54,56, lap it designated at least one side of those person in charge stopping projected parts 70,80 as the multiple projection forms which are segmented with direction.弁体の固着強度を確保しつつ、コネクタ開口部の更なる小径化を図ることの出来る、改良された医療用コネクタを提供する。弾性弁体38の外周部分の内外両面50,52に環状溝54,56を形成することによって環状の括れ状部58を設けると共に、括れ状部58よりも外周側を環状固定部46とする一方、ハウジング12の開口部65の内周縁部に弁受座68を形成すると共に、開口部65に環状リング42を固定して、これら弁受座68と環状リング42で環状固定部46を挟んで支持し、更に、弁受座68と環状リング42の対向面上に形成した係止突部70,80を環状溝54,56に係止させて、それら係止突部70,80の少なくとも一方を周方向で分断された複数の突起形状とした。
