The sign carrier structure includes a frame forming a space adapted to accept a sign therein. A pair of legs extend downwardly from the opposite sides of the frame. An inverted U-shaped bracket is coupled to the top edge of a car window. In use, the bracket is sandwiched between the window and the socket for the window. One leg is coupled to the bracket, and the other leg rests on the top of a vehicle, thereby displaying the sign through the space.