Abstract: Disclosed is a wind turbine comprising a nacelle frame provided with one main bearing on the front surface thereof; a rotor including a rotor hub provided with a hollow drum shaft, installed on the inner ring of the main bearing, at the rear thereof; an acceleration gear box including an input shaft, connected to the tip of the hollow drum shaft, at the front portion thereof and an output shaft at the rear portion thereof, and floating in the nacelle frame under the condition that the acceleration gear box is separated from the nacelle frame for increasing the rotational speed of the input shaft and transmitting the rotation of the input shaft to the output shaft; a torque supporter installed between the acceleration gear box and the nacelle frame for preventing the acceleration gear box from self-rotating; and a generator including a rotary shaft connected to the output shaft.