Abstract: An arm-rest which can be readily adjusted vertically and laterally and intended, for instance, for a toilet or lavatory seat, and which has few movable parts. A positionally adjustable arm-rest includes an arm-rest part and a frame-part, wherein one end (1) of the arm-support part is inserted together with two surrounding slide blocks (5) into the frame-part (3) enabling the arm-support part to be retained in its raised or lowered position. With the arm-rest in an essentially non-loaded state, the slide blocks (5) fix and hold the arm-rest in a horizontal position. The end of the arm-rest also includes a pressure surface (6) which acts against the inner surface of the frame-part so that the arm-rest will not give way when subjected to load. The user can readily adjust the position of the arm-rest by gripping the part and swinging it slightly upwards while moving the same to the position desired.