CONTROLLER, VEHICLE, AND CONTROL METHOD

To obtain a controller capable of controlling a regular circular turning characteristic of a vehicle during turning. A controller according to the present invention is a controller that is mounted to a vehicle including a shock absorber of a damping force adjustment type provided between a vehicle body and a wheel and outputs a command signal corresponding to a damping force of the shock absorber to an actuator that adjusts the damping force of the shock absorber. The controller is configured to output the command signal to the actuator to adjust the damping force of the shock absorber and control a regular circular turning characteristic of the vehicle when the vehicle is brought into a stable turning state where the vehicle turns in a state where a degree of a change in a physical quantity associated with a travel posture is smaller than that in a reference state.