The present invention relates to a chair (1) having a support frame (2), a seat part (8) supported thereby and having a seat base (9) and a backrest (14), which backrest is arranged near an edge of the seat part (8) at least approximately perpendicular to the seat base (9) and comprises a contact surface (15) for the back of a person sitting on the chair (1), wherein the backrest (14) is designed in such a way that it can be swiveled sideways about a swivel axis (13) which is at least approximately perpendicular to the contact surface (15) of the backrest (14).