A connector according to the present invention is a connector that includes a male connector portion, a first female connector portion, and a second female connector portion, and divides a flow path therein, wherein the male connector portion is the first connector in another medical device. It is a shape that can be connected to a female connector portion having the same shape as one female connector portion, and a shape that cannot be connected to a female connector portion having the same shape as the second female connector portion in another medical device.本発明に係るコネクタは、雄コネクタ部、第１雌コネクタ部及び第２雌コネクタ部を備え、内部に流路を区画するコネクタであって、前記雄コネクタ部は、他の医療機器における前記第１雌コネクタ部と同形状の雌コネクタ部と接続可能な形状であると共に、他の医療機器における前記第２雌コネクタ部と同形状の雌コネクタ部と接続できない形状である。
