Vehicle drive train torsional vibration control apparatus

In a rotational vibration control apparatus for suppressing rotational vibration of a drive train of a motor vehicle, a vibrational component of rotational vibration of the drive train is detected, which component is included in a certain vehicle state quantity including at least one of the torque of an output shaft, acceleration in a longitudinal direction of the vehicle, the speed of rotation of an input shaft of a transmission, and the speed of rotation of an output shaft of the transmission, and at least one of the engine torque and the change gear ratio is changed based on the detected vibrational component of the rotational vibration.