Modular retaining system for vehicles, in particular for motor vehicles

The invention relates to a modular holding system for vehicles, in particular for motor vehicles, with a holding device (1), in particular a cupholder, having at least one receptacle (5), in particular for a container, and with an adapter element (17) insertable into the receptacle (5) of the holding device (1) for holding at least one electrical device (19, 31). According to the invention, the receptacle (5) has at least one contact element (15) fed by an electrical energy source, which, when the adapter element (17) is inserted into the receptacle (5), is connected in a power-transmitting manner with a counter-contact element (23) of the adapter element (17) associated with the contact element (15), wherein the adapter element (17) is power-transmittingly connectable with the at least one electrical device (19, 31).