PURPOSE: To provide a mount for power unit furnishing a damper means to attenuate the vibration of the power unit, which can suppress the vibration effectively to both a low-frequency vibration and a high-frequency vibration.

CONSTITUTION: A fluid chamber in which a fluid is sealed is partitioned into a main chamber 12 and a sub-chamber 13, and a damper means is composed of a partition wall 11 furnishing a movable part 17, and a fluid passage 15 for damping provided to the partition wall 11. At the same time, a G sensor 18 to detect the acceleration of the power unit in the up and down direction, and an actuator 6 which consists of a piezoelectric element 5 to vibrate the movable part 17 are provided, and the actuator 6 is driven depending on the signal from the G sensor 18.