A height adjustable resting device including a first plate fixable in use against a wall of an electric household appliance; a the second plate having a resting guide slidingly carried along longitudinal edges vertical to the first; a slider sliding on a first face of the first plate, facing an opposite second face of the second plate, transversally to the longitudinal edges, integrally provided with a pin which overhangingly protrudes from the first face; a channel-shaped track on the second face, slidingly engaged by the pin and having two branches parallel to the longitudinal edges, having on an upper edge a plurality of recesses adapted to engage the pin resting thereon and for each recess, at least one pair of abutting surfaces obtained on a lower edge to guide the pin from a recess to the next as a consequence of a vertical movement of the second plate.