Abstract: An armrest (1) for use with a vehicle seat (2), comprising a unit (3) for supporting an arm of an operator of the vehicle seated in the seat, a first fixing element (4) connected to the armrest unit (3) and a second fixing element (5) can be fastened to the seat (2) on the vehicle. The first and the second fixing element can be adjusted and locked in relation to one another by means of a device (6) for adjusting the position of the armrest unit (3) in relation to the seat when using the armrest. When using the armrest, the adjusting and locking device (6), which links the first fixing element (4) and the second fixing element (5) in at least two different positions, can be used to set the armrest unit (3) to different positions by moving the armrest unit (3) in a direction having a component in the horizontal plane, aligned so that the position of the armrest unit (3) is laterally variable in relation to the seat (2).