PURPOSE: To make it possible to improve vibration proofing performance of the mount with simple construction and low cost by providing a movable member to allow actual flowing of fluid between fluid chambers, and providing a contacting part to control by itself displacing quantity in communicating holes.

CONSTITUTION: A partitioning member comprises projecting parts 32 and a rubber sleeve 16 constituting the bottom wall part of fluid chambers 26. Communicating holes 36 having a rectangular section are formed in respective projected parts 32, extending over the outer circumferential face of an inner metallic cylinder 12. The both fluid chambers 26 are mutually communicated through the communicating holes 36. Movable rubber bodies 38 functioning as movable members are arranged in respective communicating holes 36. Thus, improvement of the vibration proofing performance of the mount can be attained with simple construction and low cost.