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 a structural function in order to support any effort commonly exerted on the self-supported cushion assembly during its normal use, a cushion function, and decorative function of the self-supported cushion assembly. The frame assembly transmits the efforts to the interior vehicle part and links the self-supported cushion assembly to the interior vehicle part. Depending on the case, the frame assembly can comprise a part of the frame of the interior vehicle part, an additional frame part or both of them.