A wind turbine generator comprising: a collective pitch angle producing means that produces a collective pitch angle demand that is common to blade pitch angles of a plurality of wind turbine blades (1, 2, 3); an individual pitch angle producing means that produces an individual pitch angle demand inherent in each of the wind turbine blades (1, 2, 3); the wind turbine generator being characterized in that it further comprises: a multiplying means (21, 22, 23) that multiplies each individual pitch angle demand of the individual pitch angle producing means by an individual pitch angle gain; an individual pitch angle gain producing means that adjusts the individual pitch angle gain such that when shutdown is performed, an individual pitch angle gain is reduced gradually and reaches to zero after first set time; and an adding means (24, 25, 26) that adds the collective pitch angle demand to a multiplication result carried out by the multiplying means (21, 22, 23), and supplies a resultant value to a pitch actuator (31, 32, 33) inherent in each of the wind turbine blades (1, 2, 3) wherein the individual pitch angle gain producing means maintains a predetermined individual pitch angle gain before shutdown until second set time that is shorter than the first set time after the shutdown is started. a collective pitch angle producing means that produces a collective pitch angle demand that is common to blade pitch angles of a plurality of wind turbine blades (1, 2, 3); an individual pitch angle producing means that produces an individual pitch angle demand inherent in each of the wind turbine blades (1, 2, 3); the wind turbine generator being characterized in that it further comprises: a multiplying means (21, 22, 23) that multiplies each individual pitch angle demand of the individual pitch angle producing means by an individual pitch angle gain; an individual pitch angle gain producing means that adjusts the individual pitch angle gain such that when shutdown is performed, an individual pitch angle gain is reduced gradually and reaches to zero after first set time; and an adding means (24, 25, 26) that adds the collective pitch angle demand to a multiplication result carried out by the multiplying means (21, 22, 23), and supplies a resultant value to a pitch actuator (31, 32, 33) inherent in each of the wind turbine blades (1, 2, 3) wherein the individual pitch angle gain producing means maintains a predetermined individual pitch angle gain before shutdown until second set time that is shorter than the first set time after the shutdown is started. a multiplying means (21, 22, 23) that multiplies each individual pitch angle demand of the individual pitch angle producing means by an individual pitch angle gain; an individual pitch angle gain producing means that adjusts the individual pitch angle gain such that when shutdown is performed, an individual pitch angle gain is reduced gradually and reaches to zero after first set time; and an adding means (24, 25, 26) that adds the collective pitch angle demand to a multiplication result carried out by the multiplying means (21, 22, 23), and supplies a resultant value to a pitch actuator (31, 32, 33) inherent in each of the wind turbine blades (1, 2, 3) wherein the individual pitch angle gain producing means maintains a predetermined individual pitch angle gain before shutdown until second set time that is shorter than the first set time after the shutdown is started.