Abstract: A support device includes a base having two upward extending walls for rotatably supporting a lower end of a beam. The beam includes a number of teeth formed in the lower end for engaging with a worm which is rotatably supported on the base and includes the other end for supporting a monitor. The beam is rotated about the walls by the worm so as to move the monitor upward and downward. A bracket is pivotally coupled to the upper end of the beam for supporting the monitor. The base is rotatably supported on a clamping device for clamping onto a desk.