It is intended to provide a power generating apparatus of renewable energy type in which a braking mechanism is attached to a rotor arranged upstream of a hydraulic transmission while saving space, and a method of attaching and detaching a blade for the apparatus. The power generating apparatus of renewable energy type (1) is provided with: a rotor (2) having a hub (2B) and a main shaft (2C), the hub (2B) having at least one blade (2A) mounted thereon, the main shaft (2C) being coupled to the hub (2B); a generator (6) which generates power by torque inputted from the rotor (2); and a hydraulic transmission (4) which transmits the torque from the rotor (2) to the generator (6). A brake disc (30) is fixed to the rotor (2) by tightening together with the hub (2B) and the main shaft (2C). A brake caliper (34) is provided to force a brake pad (35) against the brake disc (30) to apply a braking force to the rotor (2).