A vibration isolator comprising: an inner tube that is coupled to one of a vibration generating part and a vibration absorbing part; an outer tube that surrounds the inner tube from a radial outer side of the inner tube and is coupled to the other of the vibration generating part and the vibration absorbing part; and an elastic body that couples the inner tube and the outer tube, wherein a plurality of pressure-absorbing fluid chambers (35, 36), which are filled with a fluid and whose walls are partly formed by the elastic body, are disposed inside the outer tube, the pressure-absorbing fluid chambers (35, 36) include a pair of first pressure-absorbing fluid chambers that communicate with each other through first restricting passages, and a second pressure-absorbing fluid chamber that communicates with an auxiliary fluid chamber, in which the fluid is filled, through a second restricting passage, the pair of first pressure-absorbing fluid chambers are disposed to sandwich the inner tube therebetween, the second pressure-absorbing fluid chamber is arranged in parallel to the inner tube in an orthogonal direction perpendicular to both an axial direction of the inner tube and a sandwiching direction in which the inner tube is sandwiched between the pair of first pressure-absorbing fluid chambers, the inner tube runs along overall lengths of the pair of first pressure-absorbing fluid chambers and the second pressure-absorbing fluid chamber in the axial direction, and when vibration is input to the vibration isolator in the sandwiching direction, the pair of first pressure-absorbing fluid chambers are individually expanded or contracted and the fluid flows through the first restricting passages, and the vibration is absorbed and attenuated. an inner tube that is coupled to one of a vibration generating part and a vibration absorbing part; an outer tube that surrounds the inner tube from a radial outer side of the inner tube and is coupled to the other of the vibration generating part and the vibration absorbing part; and an elastic body that couples the inner tube and the outer tube, wherein a plurality of pressure-absorbing fluid chambers (35, 36), which are filled with a fluid and whose walls are partly formed by the elastic body, are disposed inside the outer tube, the pressure-absorbing fluid chambers (35, 36) include a pair of first pressure-absorbing fluid chambers that communicate with each other through first restricting passages, and a second pressure-absorbing fluid chamber that communicates with an auxiliary fluid chamber, in which the fluid is filled, through a second restricting passage, the pair of first pressure-absorbing fluid chambers are disposed to sandwich the inner tube therebetween, the second pressure-absorbing fluid chamber is arranged in parallel to the inner tube in an orthogonal direction perpendicular to both an axial direction of the inner tube and a sandwiching direction in which the inner tube is sandwiched between the pair of first pressure-absorbing fluid chambers, the inner tube runs along overall lengths of the pair of first pressure-absorbing fluid chambers and the second pressure-absorbing fluid chamber in the axial direction, and when vibration is input to the vibration isolator in the sandwiching direction, the pair of first pressure-absorbing fluid chambers are individually expanded or contracted and the fluid flows through the first restricting passages, and the vibration is absorbed and attenuated.