A pair of fluid chambers in which incompressible fluid is sealed and a pair of orifice-forming members that allows one fluid chamber to communicate with the other fluid chamber are arranged between an inner cylinder and an outer cylinder. The orifice-forming member has a longitudinal groove that communicates with respective fluid chambers, an orifice channel, and a liquid storage section that allows the longitudinal groove to communicate with the orifice channel. The liquid storage section is formed wider and deeper than the orifice channel.