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 having an internal flow route through which liquid flowing in one flow route is allowed to flow into an other flow route, proximal portions included in the body and having respective one-side connection ports at which the internal flow route is connectable to the one flow route, a distal portion included in the body and having an other-side connection port at which the internal flow route is connectable to the other flow route, one-side lid portions with which the one-side connection ports are closable, and an other-side lid portion whose state is switchable between a closing state in which the other-side lid portion closes the other-side connection port such that the internal flow route is tightly closed and a ventilating state in which the other-side lid portion covers the other-side connection port such that ventilation is allowed.
