PURPOSE: To control a plurality of active mounts using one control unit by feeding a control signal directly to a front active mount from the control unit through an amplifier, and feeding a control signal to a rear active mount while delaying the signal by means of a delay device.

CONSTITUTION: An engine main body 2 is horizontally installed in the lower portion of a vehicle body via a front roll mount 3A and a rear roll mount 3B and a G sensor 50 is mounted in the mount case of one 3A of the active mounts as a mount case vibration sensor, and a G sensor 51 is mounted on a seat riser in a vehicle room, and a G sensor 52 is mounted on a panel and the output of each sensor is input to a control unit 60 through amplifiers 53,54,55. Control signals from the control unit 60 are directly fed to the actuator of one 3A of the active mounts through an amplifier 57 and to the actuator of the other active mount 3B through a delay device 70.