Mount bush

A mount bush comprising:

• an inner tubular member in a tubular shape;
• an outer tubular member in a tubular shape arranged coaxially with the inner tubular member and surrounding an outer periphery of the inner tubular member with a clearance;
• and
• an elastic member connecting the inner tubular member with the outer tubular member,
• wherein the inner tubular member includes:
• an inner yoke in a tubular shape having a coil therein;
• and an outer yoke in a tubular shape coaxial with the inner yoke and coupled with the inner yoke at a radially outer position than the coil, and
• the elastic member has a first fluid chamber and a second fluid chamber, facing each other across an axis of the inner tubular member and having magnetic fluid encapsulated therein, whose viscosity varies by a magnetic field,
• wherein the outer yoke has a communication passage communicating the first fluid chamber with the second fluid chamber, and is provided with a permanent magnet to generate a magnetic field in the communication passage.