The invention concerns a rear shelf (4) for a motor vehicle equipped with a roof foldable in its trunk and means for shifting said shelf from a use position to a retracted position wherein it is arranged vertically so as to clear a space to allow through said roof. The invention is characterized in that it comprises: a central element (5) designed to take up said positions; two lateral elements (6) each articulated to a transverse edge of said central element (5) about a longitudinal axis; cam paths (11, 17) designed to arrange said lateral elements (6) in the plane of said central element (5) when the shelf (4) is in use position and to incline said lateral elements (6) relative to said central element (5) when the shelf (4) is in retracted position.