Self-supported cushion assembly for an interior vehicle part which comprises a tridimensional fabric, a rigid plate and a main frame. The tridimensional fabric is the element which simultaneously performs the cushion and decorative functions of the self-supported cushion assembly and it is supported on the rigid plate which is in turn, supported on the main frame. The main frame is the part of the frame of the interior vehicle part that transmits the efforts to the interior vehicle part and links the self-supported cushion assembly to the interior vehicle part.