To enable a device to cope with flow of water by disassembling a fixing position of a generator and making a support stand convertible in a left and right direction.

A hydraulic power generation device is provided with a hydraulic turbine 8, the generator 1 generating power by rotary force of the hydraulic turbine, the support stand 13 supporting the same, and fixing means 12, 14 with the support stand which is disassemblable and is convertible in the left and right direction in response to flow position of water.