Abstract: The present invention relates to a structural supporting module for motor vehicle doors meant to facilitate the mounting tasks of the various functional elements incorporated in it, which are conventionally provided on such doors. The present invention is characterised by a special configuration of the window lifter mechanism with some of its components integrated in the module itself. It characterised the fact that the rails are independent of the cable redirecting means, so that the rails do not withstand the loads produced in said elements, acting only to guide the sliders.