The vehicle behavior control device is designed to control a behavior of a vehicle having steerable front road wheels. The vehicle behavior control device comprises a PCM configured to perform control to reduce a torque for the vehicle according to a steering speed of the vehicle, and acquire an understeer-causing state of the vehicle which is a factor causing understeer, wherein the PCM is further configured to perform control to, after reducing the torque, increase the torque at a change rate decided based on the understeer-causing state of the vehicle acquired by the PCM.