To provide a fluid encapsulation type cylindrical mount in which three independent equilibrium chambers put in communication with pressure receiving chamber through three orifice passages tuned to the low, medium, and high frequency ranges are formed effectively while the capacity change allowable amount to permit the vibration isolating characteristic to be exerted satisfactorily is secured within a finite space and the vibration isolating effect based upon the flow effect of the fluid can be exerted effectively for the input vibrations of three different frequency ranges.

The second equilibrium chamber 62 with which the second orifice passage 74 tuned to the low frequency range is in communication and the third equilibrium chamber 64 with which the third orifice passage 76 tuned to the high frequency range is in communication are formed in a space positioned on the side opposite the pressure receiving chamber 58 about a shaft 12 pinched in the vibratory input direction, while the first equilibrium chamber 60 with which the first orifice passage 72 tuned to the intermediate frequency range is in communication is formed in a space positioned on the outside of the pressure receiving chamber 58.