The present invention relates to a method of manufacturing a vibration isolator (10), wherein in a sealing step in which a liquid mixture is sealed inside the interior of a first mounting component (11) in a vibration isolator main body (21), after the internal pressure inside the first mounting component (11) has been changed to a negative pressure which is equal to or greater than the vapor pressure of a first liquid (L1) which has the lower vapor pressure from among the first liquid (L1) and a second liquid (L2), the first liquid (L1) is injected into the interior of the first mounting component (11) so as to raise the internal pressure thereof, and, thereafter, the second liquid (L2) is injected into the interior of the first mounting component (11). According to the present invention, when a liquid mixture which contains a plurality of types of liquid which each have mutually different vapor pressures is sealed inside the first mounting component, it is possible to accurately and with superior reproducibility seal desired quantities of each of the plurality of types of liquid and at the same time prevent air from being retained inside the first mounting component (11).