PROBLEM TO BE SOLVED: To provide a connector exhibiting excellent sealability and injection properties, and a valve element for a connector to be used in the connector.SOLUTION: A connector 1 includes a connector tube 3 and a valve element 5 for a connector. The connector tube 3 includes a tubular housing part 11 with a channel 21 communication parts 12 and 13 whose diameter is smaller than the inner diameter of the tubular housing part 11 and which are opened at both ends of the channel 21 and an injection part 14 opened on the peripheral surface of the channel 21. The valve element 5 for the connector includes an outer peripheral surface 34 and openings 32a and 32b to be housed in the connector tube 3 in such a way that the outer peripheral surface 34 is closely in contact with an inner peripheral surface 28 of the tubular housing part 11 and that the openings 32a and 32b are closely in contact with inner surfaces 26a and 26b of the tubular housing part 11. The posture of the connector 1 can be shifted to a sealed posture in which the inner peripheral surface 28 and the inner surfaces 26a and 26b are closely in contact with each other and to an opened posture in which a head 18 is retracted to the tubular housing part 11. The connector 1 and the valve element 5 for the connector are provided.COPYRIGHT: (C)2013,JPO&INPIT【課題】優れたシール性及び注入性を発揮するコネクタ、並びに、このコネクタに用いられるコネクタ用弁体を提供すること。【解決手段】流路21を有する管状収納部11、その内径よりも小径で流路21の両端に開口する連通部12、13及び流路21の周面に開口する注入部14を有するコネクタ管3と、外周面34及び開口部32a及び32bを有し、外周面34が管状収納部11の内周面28に密接すると共に開口部32a及び32bが管状収納部11の内面26a及び26bに密接するようにコネクタ管3に収納されるコネクタ用弁体5とを備え、内周面28及び内面26a及び26bが密接する密閉姿勢と頭部18が管状収納部11に後退する開放姿勢とに移行可能なコネクタ1、並びに、前記コネクタ用弁体5。【選択図】 図1