Vehicle behavior control device

A vehicle behavior control device, comprising:

• an ith suspension mounted on an ith wheel of four wheels of a vehicle (where i=1 to 3);
• a fourth suspension mounted on a fourth wheel other than the ith wheel;
• and
• a controller, wherein
• the ith suspension includes an ith actuator configured to apply a control force in an up-down direction to the ith wheel,
• the controller is configured to
• calculate a required value of a behavior parameter representing behavior of the vehicle,
• convert the required value of the behavior parameter to an ith required control force for the ith actuator, and
• control the behavior of the vehicle by controlling the ith actuator based on the ith required control force, and
• the controller is configured to, when a kth required control force (where k is any of 1 to 3) is greater than a kth output range according to an output capability of a kth actuator, perform a required control force reduction process of reducing all of a first required control force, a second required control force, and a third required control force, and control the ith actuator based on the ith required control force after the required control force reduction process.