A plug-in connector is provided that can be released easily and reliably from an assigned mating connector, and has increased lifetime. The plug-in connector includes a plug head and a sliding sleeve. The plug head has a hollow body with at least one cable connector, and at least two locks located on at least one surface of the body. The locks are connected by a bridge, and extend in a sliding direction. Each lock includes at least one free end. The sliding sleeve includes an opening to receive the plug head in a sliding direction and is movable in an axial direction relative to the plug head. An unlocking element is located on an inner side of the opening and positioned to contact the bridge of the plug head. The unlocking element pushes against the locks when the sliding sleeve moves in the sliding direction.