A wind turbine generator comprising: a tower; a nacelle supported by the tower; a rotation shaft rotatably supported by the nacelle in such a state that the rotation shaft is tilted with respect to a horizontal axis of the rotation shaft; at least two blades provided for the rotation shaft with a pitch angle of each of the blades (16a, 16b) around an axis along a radial direction of the rotation shaft being adjustable; a pitch drive mechanism for adjusting the pitch angle of each of the blades (16a, 16b); and a control unit configured to determine an adjustment amount of the pitch angle by which the pitch drive mechanism is configured to adjust the pitch angle, wherein the control unit characterized by comprising: a Mzn moment calculation part for calculating a Mzn moment impinging on the rotation shaft around a vertical axis based on a load impinging on each of the plurality of blades; a basic Mzn component calculation part for extracting a basic Mzn component from the Mzn moment, the basic Mzn component comprising at least a basic frequency component corresponding to a rotation speed of the rotation shaft and a stationary component; a correction Mzn component calculation part for calculating a correction Mzn component which is a vertical component of the Mxn moment impinging on the rotation shaft around the rotation shaft; and a pitch angle adjustment amount determination part for calculating a Mzn deviation which is a difference between the basic Mzn component and the correction Mzn component and determining the adjustment amount of the pitch angle of each of the blades based on the Mzn deviation. a tower; a nacelle supported by the tower; a rotation shaft rotatably supported by the nacelle in such a state that the rotation shaft is tilted with respect to a horizontal axis of the rotation shaft; at least two blades provided for the rotation shaft with a pitch angle of each of the blades (16a, 16b) around an axis along a radial direction of the rotation shaft being adjustable; a pitch drive mechanism for adjusting the pitch angle of each of the blades (16a, 16b); and a control unit configured to determine an adjustment amount of the pitch angle by which the pitch drive mechanism is configured to adjust the pitch angle, wherein the control unit characterized by comprising: a Mzn moment calculation part for calculating a Mzn moment impinging on the rotation shaft around a vertical axis based on a load impinging on each of the plurality of blades; a basic Mzn component calculation part for extracting a basic Mzn component from the Mzn moment, the basic Mzn component comprising at least a basic frequency component corresponding to a rotation speed of the rotation shaft and a stationary component; a correction Mzn component calculation part for calculating a correction Mzn component which is a vertical component of the Mxn moment impinging on the rotation shaft around the rotation shaft; and a pitch angle adjustment amount determination part for calculating a Mzn deviation which is a difference between the basic Mzn component and the correction Mzn component and determining the adjustment amount of the pitch angle of each of the blades based on the Mzn deviation. a Mzn moment calculation part for calculating a Mzn moment impinging on the rotation shaft around a vertical axis based on a load impinging on each of the plurality of blades; a basic Mzn component calculation part for extracting a basic Mzn component from the Mzn moment, the basic Mzn component comprising at least a basic frequency component corresponding to a rotation speed of the rotation shaft and a stationary component; a correction Mzn component calculation part for calculating a correction Mzn component which is a vertical component of the Mxn moment impinging on the rotation shaft around the rotation shaft; and a pitch angle adjustment amount determination part for calculating a Mzn deviation which is a difference between the basic Mzn component and the correction Mzn component and determining the adjustment amount of the pitch angle of each of the blades based on the Mzn deviation.