Abstract: A device for training a person to ride a unicycle including a base for making contact with a floor or ground, two hand rails mounted on the base, and two support rods mounted uprightly on the base such that the two support rods are located between the two hand rails, and that the two support rods are separated from each other by a distance corresponding to the distance between two knobs of the fork tube of the unicycle. The two support rods are provided respectively at the top end thereof with a locating seat having a locating slot for receiving one of the two knobs of the fork tube of the unicycle such that the unicycle can be caused by the rider to engage in a rocking motion.