Abstract: The invention relates to a water-power motor adapted to be driven by a rising and falling water surface, for instance the wave motion thereof. The novel features of the invention reside in that the water-power motor comprises one or more driving wheels each of which has a plurality of compartments defined in one direction by bottom shutters pivotally mounted in the wheel and allowing the wheel to rotate under water without any appreciable resistance, and in that the wheel or wheels are adapted to cooperate with an equalizer device in the form of a container which is supplied with water when the water surface is on a relatively high level and which in its turn supplies water to the wheel or wheels when the water surface is on a relatively low level.