Abstract: The present invention concerns a piece of seating furniture convertible to bed, comprising a stationary body (1) and at least one articulated frame (2) attached to the body and consisting of a rear back part (3) and a front back part (4) and of a seat part (5) carried on a carriage (14) by means of levers (7, 13). The invention is characterized in that the rear part (3) of the back of the articulated frame (2) is significantly shorter than the front part (4) of its back and, by the intermediate of a further frame part (9), pivotably attached to the stationary body (1) around a transverse shaft (10) provided in the rear part of the body (1), the said further frame part (9) being prevented by stop members (11) from being pivoted to below the horizontal plane. At the front end of the seat part (5), a foot rest (8) in itself known is provided, which can be affected and folded out by means of the position of the levers (7, 13).