Abstract: A chair comprises a seat (6), a back (7) and a frame (2, 3, 4, 5). In order to give the user a comfortable opportunity to change his position during the use of the chair, the positions of both the chair (6) and the back (7) are readjustable with respect to the frame. The angular position of the seat is readjustable from a first position to a more backward inclined position and the back (7) is readjustable from a first position to a more backwardly inclined position. The back (7) is during the readjustment lowerable with respect to the seat (6) in order to avoid movements between the body and the clothes of the user during the readjustment of the chair.