To provide a hydraulic power generating device with a snow melting device capable of effectively utilizing potential energy of water melted by the snow melting device for hydraulic power generation, and using electricity generated by the hydraulic power generating device for the snow melting device.

The hydraulic power generating device with the snow melting device consists of the hydraulic power generating device A having a lower water tank 1 placed in the lower part, a water supply pipe 3 supplying water from the lower water tank 1 to an upper water tank 2, a water supply pump 4 provided in the middle of the water supply pipe 3, a hydraulic pipe 5 dropping water from the upper water tank 2 to the lower water tank 1, a water turbine 10 provided in the middle of the hydraulic pipe 5, and a generator 7 driven by the water turbine 10 through a speed-changing means 6, and the snow melting device B having a heating element 31, a reflector 32 deflecting a heat ray from the heating element 31 in a prescribed direction, and a support arm 35 supporting a heating part 30.