Abstract: Adjustable chair, whereby the seat of the chair comprising on each side a rail (10) secured to a front portion under the seat (3) and resting on a roller (11) connected with the chair frame, the seat being, in the rear portion on each side, connected turnably with a guide (5) secured to the frame where the guide having slideably arranged a first glider (6), the back (4) comprising a downwards and forwards directed prolongation and being turnably connected with the first glider (6), the front end of the prolongation being turnably connected with a second glider (8) being slideably arranged on a second guide (7), the second guide thereby being connected with the frame, and first and second guides (5, 7) being arranged in an obtuse angle in relation to each other such that the distance between the rear portion of seat and the lower portion of the back substantially is maintained whereas the angle between the seat and the back is altered when the back is moved backwards by the user in such a way that the gliders