1. A vehicle behavior control system comprising: a steering angle obtaining module configured to obtain a steering angle; a steering angular velocity obtaining module configured to obtain a steering angular velocity; a vehicle speed obtaining module configured to obtain a vehicle speed; a standard yaw rate calculation module configured to calculate a standard yaw rate of a vehicle based on the vehicle speed and the steering angle; a limit yaw rate setting module configured to set a limit yaw rate based on the vehicle speed, the limit yaw rate being a yaw rate of a limit to a stable driving of the vehicle; and a behavior stabilization control module configured to execute a behavior stabilization control so as to stabilize a behavior of the vehicle by giving a braking force to a turning outer wheel of the vehicle based on a target braking force, wherein the behavior stabilization control module has: a control intervention threshold setting section configured to set a control intervention threshold based on the limit yaw rate and the steering angular velocity; and a control intervention determination section configured to determine that the behavior stabilization control is to be started in case the standard yaw rate exceeds the control intervention threshold.