Abstract: An armrest (1) for a work chair is adjustable in the vertical and longitudinal directions. Moreover, the armrest (1) is pivotal in a substantially horizontal plane about a pivot axis (13) which is disposed in a rear end region of the armrest (1). The armrest (1) is disposed on a rail (6) longitudinal in relation to the longitudinal axis of the armrest (1) in the lower region (5) of the armrest (1). The rail (6) is pivotally connected to the armrest (1) in the pivot axis (13). The rail (6) is further displaceable along its length in relation to a pedestal (2) which supports the armrest (1).