The disclosure relates to a holding frame for holding plug connector modules, in particular for installation in plug connector casings and/or for screwing onto wall surfaces. In order to allow improved handling and more reliable populating and assembly of the holding frame comprising frame halves, it is proposed that the holding frame in the plug-in state has a stop for stopping the plug connector module on insertion into the holding frame, wherein the stop is so designed that when a plug connector module is stopped in the plug-in state, holding frame holding devices and plug module holding devices engage in each other in the holding state.