A damping control device and a damping control method for controlling damping of a vehicle are provided. Damping control of the vehicle is performed by adaptively switching a damping mode while considering energy consumption (fuel economy, a consumption amount of a battery, and the like) according to a state of the vehicle such as a state of an interior of the vehicle, a driving state of the vehicle, and an ambient environment. That is, the state of an interior of the vehicle, the driving state of the vehicle, and the ambient environment are constantly monitored, and the damping mode is switched to a weak damping mode in the case where unnecessity of damping as strong as a current state is determined whereas the damping mode is switched to a strong damping mode in the case where necessity of stronger damping is determined.