To realize a running water power generator suitable for performing running water power generation, in particular performing running water power generation by using an existing water channel for a water turbine.

Two drums 15, 16 are arranged on a floating base 1. A circulation belt 18 is stretched between the two drums 15, 16. Splines 19 are mounted on the circulation belt 18. The drums 15, 16 are rotated due to circulation of the splines 19 by the force of running water 27. This is transferred to a power generator 12 and power is generated.