MOUNT BUSHING

A mount bushing is proposed. The mount bushing is configured to minimize frequency shifting according to difference of dynamic properties applied by a load input to a mount. The mount bushing includes an outer tube (100), an inner tube (200) provided in the outer tube (100), a rubber part (300) provided between the outer tube (100) and the inner tube (200), a tubular mass (400) provided in the rubber part (300) and having an opening (420) formed by partially penetrating an outer circumferential surface thereof, and a stopper (500) shaped to protrude outward from the inner tube (200) to pass through the opening (420) of the tubular mass (400), wherein the mount bushing is configured to minimize mutual interference between the mass (400) and the stopper (500) in deformation due to an external force.