The invention relates to a holding frame for retaining plug connector modules and for installing in plug connector housings or for screwing onto wall surfaces, wherein the plug connector modules are inserted into the holding frame and retention means on the plug connector modules interact with cut-outs provided on opposite wall parts (side parts) of the holding frame. According to the invention, the holding frame is formed of two halves, which are articulated to each other, and the cut-outs for retaining the plug connector modules are formed in the side parts of the holding frame as openings closed on all sides. The holding frame is folded open in order to insert the plug connector modules and then closed, wherein the plug connector modules are then interlockingly held in the holding frame by means of the retention means.