Abstract: A chaise longue includes two foot frames of an inverted U shape, a seat and backrest composed of two side rods and a soft surface sheet fixed between the two side rods, which have respectively a downwardly sloped front portion, a nearly horizontal intermediate portion and an upwardly sloped portion, and a support device pivotally fixed with rear sides of upper ends of the two side rods. The support device consists of two support rods and a support base connected pivotally with inner ends of the two support rods. The support rods have their outer ends respectively pivotally connected to the two side rods so that the two support rods may be expanded to form a line with the support base between the two side rods to expand the soft surface sheet.