Abstract: A portable sun shade for being mounted on a seat. The portable sun shade includes a canopy; a frame for supporting the canopy above the seat, the frame includes an elongated first frame member having a first end and a second end, an elongated second frame member having a first end and a second end, first structure joining the first ends of the first and second frame members together, an elongated third frame member having a first end and a second end, second structure joining the second ends of the first and third frame members together, an elongated fourth frame member having a first end and a second end, and third structure joining the second ends of the first and fourth frame member together; the canopy being positioned on the third and fourth members; and attaching structure for attaching the frame to the back rest portion of the seat.