A plug-in connector having an outer conductor electrically and mechanically connected to an outer conductor of a cable and forming an electromagnetic screen for the plug-in connector, and having an insulating part securing at least one inner conductor part in a predetermined position relative to the outer conductor part, and having a housing in which the outer conductor part and the insulating part are arranged. An anti-rotation lock is connected to the housing to be secure in rotation therewith and which fits through the outer conductor part and into the insulating part such that the insulating part and the housing are connected together by the anti-rotation lock to be secure in rotation with one another.