Abstract: A swimming element enjoying system capable of applying an external stimulus to a swimming element moved at a predetermined rhythm, to thereby permit the swimming element to carry out different motion, to thereby provide an observer with a fresh surprise, so that the observer may be soothed or healed. A swimming element made in imitation of an aquatic life and a drive unit for driving the swimming element each are provided with a permanent magnet. The permanent magnet of the drive unit is rotated, to thereby permit an attracting/repulsing action to be carried out between the permanent magnets, leading to random vertical motion of said swimming element. Motion of the swimming element is randomly varied when a sensor detects an external stimulus.