To generate rotational energy without needing natural energy such as water and wind, and realize a display device or the like with various ornamental and display functions.

This rotation generating device is formed of a post 1 provided in an upright state, and a rotation body 3 provided rotatably around a horizontal shaft 2 by pivotally supporting the center position to the upper part of the post 1. The rotation body 3 comprises frames 3a formed parallel in the longitudinal direction; a weight 3b provided between both end parts of the frames 3a; and a gear mechanism 3c rotated by the rotation of the rotation body 3 continuously rotated by the action of the weight 3b, as an operation source.