Water flow power generation equipment comprises an underwater body of revolution (32) rotating by water flow (11), a drive side liquid pressure pump (34) for holding the front end (52) of the underwater body of revolution (32) at a predetermined position in the water, a power transmitting section (40) for transmitting the rotary power of the underwater body of revolution (32) held by the drive side liquid pressure pump (34) above the water surface (9), and a generator (39) arranged above the water surface and being driven with a power transmitted by the power transmitting section (40). Since the underwater body of revolution (32) has a barrel portion (51) of streamline profile from the front end toward the rear end, a supporting portion (33) oscillating in the direction intersecting the axial direction (43) of the underwater body of revolution between the front end of the barrel portion (51) and the drive side liquid pressure pump (34), and a plurality of blades (54) projecting radially from the periphery of the barrel portion (51), water flow power generation equipment generating power stably for a long term is provided.