Abstract: A louvered window shade device for hinged installation relative to the rear door windows of automobiles, particularly of the body types commonly known as fast-backs, hatch-backs, etc., wherein substantial portions of the interior compartments thereof are normally exposed to the direct rays of the sun. A pair of top plates are hinged to the top edge portion of a louvered shade and include oppositely outwardly extending clamps for fixed engagement to opposed top side edge portions of the back door, and a pair of similar clamps engage the respective side edges of the door adjacent the lower edge of the louvered shade. The lower clamps each provide a latch device for openable engagement with the louvered shade.