A vehicle behavior control apparatus comprising: a steering angle detector arranged to detect a steering angle of a vehicle; a lateral acceleration detector arranged to detect a lateral acceleration of the vehicle; a yaw rate detector arranged to detect an actual yaw rate of the vehicle; and a controller arranged to control behavior of the vehicle based on output values from at least the steering angle detector and the yaw rate detector, wherein the controller includes: an abnormality detector arranged to detect as to whether or not the yaw rate detector is in an abnormal state; and a normality detector arranged to detect as to whether or not the yaw rate detector is in a normal state; characterized in that: the normality detector includes: a steering angle yaw rate calculator arranged to calculate a steering angle yaw rate based on the output value of the steering angle detector, a first difference calculator arranged to calculate a first difference which is a difference between the steering angle yaw rate and the actual yaw rate; a lateral G yaw rate calculator arranged to calculate a lateral G yaw rate based on the output value of the lateral acceleration detector; a second difference calculator arranged to calculate a second difference which is a difference between the lateral G yaw rate and the actual yaw rate, and a normality determination section arranged to determine that the yaw rate detector is in the normal state when the first difference falls within a first predetermined value and the second difference falls within a second predetermined value. a steering angle detector arranged to detect a steering angle of a vehicle; a lateral acceleration detector arranged to detect a lateral acceleration of the vehicle; a yaw rate detector arranged to detect an actual yaw rate of the vehicle; and a controller arranged to control behavior of the vehicle based on output values from at least the steering angle detector and the yaw rate detector, wherein the controller includes: an abnormality detector arranged to detect as to whether or not the yaw rate detector is in an abnormal state; and a normality detector arranged to detect as to whether or not the yaw rate detector is in a normal state; an abnormality detector arranged to detect as to whether or not the yaw rate detector is in an abnormal state; and a normality detector arranged to detect as to whether or not the yaw rate detector is in a normal state; characterized in that: the normality detector includes: a steering angle yaw rate calculator arranged to calculate a steering angle yaw rate based on the output value of the steering angle detector, a first difference calculator arranged to calculate a first difference which is a difference between the steering angle yaw rate and the actual yaw rate; a lateral G yaw rate calculator arranged to calculate a lateral G yaw rate based on the output value of the lateral acceleration detector; a second difference calculator arranged to calculate a second difference which is a difference between the lateral G yaw rate and the actual yaw rate, and a normality determination section arranged to determine that the yaw rate detector is in the normal state when the first difference falls within a first predetermined value and the second difference falls within a second predetermined value. the normality detector includes: a steering angle yaw rate calculator arranged to calculate a steering angle yaw rate based on the output value of the steering angle detector, a first difference calculator arranged to calculate a first difference which is a difference between the steering angle yaw rate and the actual yaw rate; a lateral G yaw rate calculator arranged to calculate a lateral G yaw rate based on the output value of the lateral acceleration detector; a second difference calculator arranged to calculate a second difference which is a difference between the lateral G yaw rate and the actual yaw rate, and a normality determination section arranged to determine that the yaw rate detector is in the normal state when the first difference falls within a first predetermined value and the second difference falls within a second predetermined value. a steering angle yaw rate calculator arranged to calculate a steering angle yaw rate based on the output value of the steering angle detector, a first difference calculator arranged to calculate a first difference which is a difference between the steering angle yaw rate and the actual yaw rate; a lateral G yaw rate calculator arranged to calculate a lateral G yaw rate based on the output value of the lateral acceleration detector; a second difference calculator arranged to calculate a second difference which is a difference between the lateral G yaw rate and the actual yaw rate, and a normality determination section arranged to determine that the yaw rate detector is in the normal state when the first difference falls within a first predetermined value and the second difference falls within a second predetermined value.