A connector is to be connected to a syringe assembly, which is provided with at least one syringe having an outer cylinder with a tube-shaped port protruding from the leading end section, and a holder which holds the syringe. The connector is provided with: a connector main body to be mounted on a medical solution container wherein a medical solution is contained a tube-shaped fitting section, which protrudes from the upper section of the connector main body, has the port of the syringe fitted therein, and connects the inside of the syringe and the inside of the medical solution container when the port of the syringe is fitted in the fitting section and fixing means, which has a lock mechanism that fixes the syringe assembly to the connector main body when the port of the syringe is fitted in the fitting section, an operating section that performs fixing releasing operation of releasing the fixed state provided by the lock mechanism, and a push-out section that pushes out the syringe assembly toward the base end with the fixing releasing operation when the fixing releasing operation is performed.
