Trunk of a motor vehicle

A trunk (1) of a motor vehicle (2) having an opening (6) providing access from the outside, a floor (4), two side walls (5) substantially transversal to the floor (4), a load platform (20), which is defined by a first edge (21) facing the opening (6), by a second edge (22) substantially parallel to the first edge (21) and by two side edges (23) substantially transversal to the first and second edge (21, 22); the trunk (1) being further equipped with two shelves (30), each of which is integral with a respective side wall (5) and has a respective groove (37) overlooking the groove (37) of the other first shelf (30) and adapted to be slidingly engaged by a respective said side edge (23) in order to arrange and keep the load platform (20) stable in a tilted position with respect to the floor (4).