A horizontal axis wind turbine comprising: - a rotor including a hub and at least two blades (4a - 4c); - a nacelle to support the rotor with a main shaft connected to the hub; - a tower to support the nacelle in a manner capable of performing a yaw rotation; - an independent pitch control device to independently control a pitch angle of each of the blades (4a - 4c); and - a yaw control device to control the yaw rotation of the nacelle, - wherein the horizontal axis wind turbine is an up-wind type one including: an operation mode to put the rotor to a windward side of the tower by the control of the yaw control device when a wind speed has a predetermined value or less, and to utilize wind force through a rotation of the rotor; and a waiting mode to wait in preparation for the operation mode when a wind speed exceeds the predetermined value, characterized in that (a) the independent pitch control device includes a control operation comprising a first step of changing all the blades (4a - 4c) to be in feathering states when the wind speed exceeds the predetermined value, a second step of changing one blade (4a - 4c) from being in a feathering state toward a flat side after the first step and of returning the one blade (4a - 4c) to be in the feathering state when the nacelle obtains a yaw angle displacement of a predetermined value or more to the wind direction, and a third step of holding all the blades (4a - 4c) to be in the feathering states until a return to the operation mode after the second step, and (b) the yaw control device includes a control operation to control a yaw brake to take a braking value allowing the yaw rotation by torque around a yaw axis, the torque loaded on the nacelle by the wind force, when the wind speed exceeds the predetermined value, - wherein the yaw angle displacement of the nacelle has been obtained in the second step and the third step by executing the control operation (a), and by executing the control operation (b) before executing the second step, as the waiting mode, so that the rotor is allowed to swing to a leeward side of the tower. - a rotor including a hub and at least two blades (4a - 4c); - a nacelle to support the rotor with a main shaft connected to the hub; - a tower to support the nacelle in a manner capable of performing a yaw rotation; - an independent pitch control device to independently control a pitch angle of each of the blades (4a - 4c); and - a yaw control device to control the yaw rotation of the nacelle, - wherein the horizontal axis wind turbine is an up-wind type one including: an operation mode to put the rotor to a windward side of the tower by the control of the yaw control device when a wind speed has a predetermined value or less, and to utilize wind force through a rotation of the rotor; and a waiting mode to wait in preparation for the operation mode when a wind speed exceeds the predetermined value, characterized in that (a) the independent pitch control device includes a control operation comprising a first step of changing all the blades (4a - 4c) to be in feathering states when the wind speed exceeds the predetermined value, a second step of changing one blade (4a - 4c) from being in a feathering state toward a flat side after the first step and of returning the one blade (4a - 4c) to be in the feathering state when the nacelle obtains a yaw angle displacement of a predetermined value or more to the wind direction, and a third step of holding all the blades (4a - 4c) to be in the feathering states until a return to the operation mode after the second step, and (b) the yaw control device includes a control operation to control a yaw brake to take a braking value allowing the yaw rotation by torque around a yaw axis, the torque loaded on the nacelle by the wind force, when the wind speed exceeds the predetermined value, (a) the independent pitch control device includes a control operation comprising a first step of changing all the blades (4a - 4c) to be in feathering states when the wind speed exceeds the predetermined value, a second step of changing one blade (4a - 4c) from being in a feathering state toward a flat side after the first step and of returning the one blade (4a - 4c) to be in the feathering state when the nacelle obtains a yaw angle displacement of a predetermined value or more to the wind direction, and a third step of holding all the blades (4a - 4c) to be in the feathering states until a return to the operation mode after the second step, and (b) the yaw control device includes a control operation to control a yaw brake to take a braking value allowing the yaw rotation by torque around a yaw axis, the torque loaded on the nacelle by the wind force, when the wind speed exceeds the predetermined value, - wherein the yaw angle displacement of the nacelle has been obtained in the second step and the third step by executing the control operation (a), and by executing the control operation (b) before executing the second step, as the waiting mode, so that the rotor is allowed to swing to a leeward side of the tower.