This outdoor unit comprises: a compressor that has a compression mechanism that compresses a refrigerant; a gas-liquid separator that has a container for storing liquid refrigerant; and, aside from a main refrigerant circuit which is constituted from the compressor, a condenser, a throttle device, an evaporator, and the gas-liquid separator being connected by piping and circulates the refrigerant, an internal cooling circuit that is constituted from the gas-liquid separator and the compressor being connected by piping, allows the liquid refrigerant in the container to circulate without going through the compression mechanism, and cools the refrigerant being compressed in the compression mechanism.
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