CONTROLLER, VEHICLE, AND CONTROL METHOD

The present invention obtains a controller capable of suppressing worsening of comfort of an occupant in a vehicle when compared to the background art. The controller according to the present invention is a controller that is mounted to the vehicle and outputs a command signal corresponding to a damping coefficient of a shock absorber to an actuator that adjusts the damping coefficient of the shock absorber of a damping force adjustment type. In the case where, in the vehicle, a portion on a wheel side with the shock absorber being a reference is set as an unsprung portion, where a state where a frequency of the unsprung portion is higher than a prescribed frequency is set as a first frequency state, and where a state where the frequency of the unsprung portion is lower than the prescribed frequency is set as a second frequency state, the controller is configured to output, to the actuator, such a command signal that reduces the damping coefficient of the shock absorber to be smaller than the damping coefficient of the shock absorber in the second frequency state when a state becomes the first frequency state.