To provide a medical connector that allows ventilation of vapor used in vapor sterilization and has an internal flow route that is tightly closable without using any separate clamping device. A medical connector includes a body 1 having an internal flow route R through which liquid flowing in one flow route is allowed to flow into an other flow route, proximal portions (2a and 2b) included in the body 1 and having respective one-side connection ports (Ca1 and Ca2) at which the internal flow route R is connectable to the one flow route, a distal portion 3 included in the body 1 and having an other-side connection port Cb at which the internal flow route R is connectable to the other flow route, one-side lid portions (5a and 5b) with which the one-side connection ports (Ca1 and Ca2) are closable, and an other-side lid portion 6 whose state is switchable between a closing state in which the other-side lid portion 6 closes the other-side connection port Cb such that the internal flow route R is tightly closed and a ventilating state in which the other-side lid portion 6 covers the other-side connection port Cb such that ventilation is allowed.
