To provide a fluid-sealed type vibration control device of novel structure, in which a passage for releasing excessive negative pressure which is generated in a pressure receiving chamber in inputting a large vibration load, to an equilibrium chamber is stably controlled to be opened/closed, and an opening/closing property of the passage can be easily and highly accurately set.

A partition member 49 is positioned to face a first mounting member 12 so as to sandwich the pressure receiving chamber 70 therebetween. A through hole 96 is formed to one of the partition member 49 and the first mounting member 12, and a fitting part 100 is formed to the other of them. A connection flow passage 116 for connecting the pressure receiving chamber 70 with the equilibrium chamber 72 with a short passage length by using the fitting part 100. A valve means 114 is formed to a fit-in part of the fitting part 100 fitted into the through hole 96, so as to switch the state of the connection flow passage 116 from a shut-off state to a communication state, by displacing the fitting member 100 in an inlet/outlet direction along with a relative displacement between the first mounting member 12 and a second mounting member 14 when vibration is input.

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