To provide a water power generator capable of providing some power even with little stream of water.

The water power generator comprises a water wheel 3 which is rotated by the stream of water, and a generating part 10 which converts the rotational force of the water wheel 3 to an electric power. The power generating part 10 comprises a rotor 15 which is provided continuous with a rotating shaft 9 of the power generating part 10, and comprises multiple coils 15a so arranged as to be symmetric while a phase is changed little with the rotating shaft 9 as a center, a magnetic substance 12 secured close to the coil 15a to form a magnetic field so that the density of a magnetic flux that passes each coil 15a as the rotor 15 rotates increases/decreases, and a rectifying part 19 which rectifies the electric current flowing through each coil 15a.