To provide a rotary friction device generating stable friction resistance more effectively.

A structure is constituted with a rotary body 1 and a receiver body opposed in radial direction with multiple rollers 2 placed between them. The angle α1 of the rolling axis of the individual rollers 2 from the rotation axis of the rotary body 1 is designated to be larger than 5° and smaller than 20°, and the angle β1 of the rolling axis of the individual rollers 2 from a plane containing the rotation axis of the rotary body 1 is designated to be larger than 25° and smaller than 90°, thereby generating effective and stable frictional force constantly.