The vehicle behavior control device comprises a brake control system (18) capable of applying different braking forces, respectively, to right and left road wheels of a vehicle (1). The vehicle behavior control device further comprises: a steering angle sensor (8); a vehicle speed sensor (10); a yaw rate sensor (12); and a yaw moment setting part (22) in PCM (14) configured to decide a target yaw rate of the vehicle based on a steering angle and a vehicle speed, and set, based on a change rate of a difference between an actual yaw rate and the target yaw rate, a yaw moment oriented in a direction opposite to that of the actual yaw rate of the vehicle, as a target yaw moment, whereby the brake control system can regulate the braking forces of the road wheels so as to apply the target yaw moment to the vehicle.