To provide an apparatus and method of reliquefying gas which stably performs reliquefying processing irrespective of the state of a boil-off gas supplied to a compressor.

The apparatus 1 of reliquefying gas, which is provided with a storage tank which stores liquefied gas, a boil-off compressor 30 which compresses the boil-off gas evaporated within the storage tank, a condenser 15 which condenses by cooling the boil-off gas compressed at the boil-off gas compressor 30 and a separator 33 which is fed with a condensed fluid condensed at the condenser 15 and then separates the condensed liquid into the gas and the liquid, comprises gas supplied piping which leads gas and/or liquid separated at the separator 33 to the suction side of the boil-off gas compressor 30.

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