Abstract: A detachable, adjustable headrest device for a folding chair can be used either with a recreational vehicle or on a lawn chair. The headrest device comprises a U-shaped tubular bracket supporting a corresponding geometric plate having two vertical parallel slots. A planar rectangular plate having two threaded bolts supports a rectangular block of foam padding covered by a plastic sheet. The plate and covered padding fasten to the bracket through the parallel slots, which provide for vertical adjustment. The bottom portions of the tubular bracket are adapted to fit onto the top portion of a folding chair with a tubular metal frame by friction-fitting cutouts.