Abstract: A reclining seat with movable armrest, with such an arrangement wherein a seat back of the seat, which is provided with the movable armrest, is coupled via first and second connecting arm to a reclining device, and the first connecting arm supports both seat back and armrest, while the second connecting arm connects the first connecting means with the reclining device, whereby a total width of both seat back and armrest is made qual to a width of seat cushion. Thus, the armrest, if located at an upright non-use position along the seat back, may serves as one of the seat back at such total width equal to that of the seat cushion.