Abstract: Chair (1) with tilt mechanism for synchronous adjustment of a seat (4) and a backrest (6) which are swivel mounted on a base (8), from a normal working position in which the seat (4) assumes a horizontal position and the backrest (6) a vertical position, into positions with a different inclination of the seat (4) and backrest (6) and with height adjustment for the seat and backrest. The position of the seat (4) and backrest (6), as adjusted by a catch mechanism, is released easily by pulling up an actuation lever attached laterally under a seat support (3) on the base (8) of the swivel chair (1) and by leaning lightly against the backrest (6) to release it from a restoration spring (16) of the tilt mechanism acting on the seat support (3) with the seat (4) and the back (6). In order to adjust the desired normal working position or a more or less inclined position of the seat (4) and backrest (6), the actuation lever need simply be pressed down.