A refrigerant circuit, comprising: - a compressor; - a condenser; - an expansion device; - a plurality of evaporators having different heat loads, the plurality of evaporators being connected in parallel between the expansion device and a suction side of the compressor, the plurality of evaporators comprising a first evaporator and a second evaporator having a smaller heat load than does the first evaporator; and - a branch circuit (9, 109, 209, 309, 509) provided between the expansion device and the plurality of evaporators, and configured to distribute refrigerant to each of the plurality of evaporators, the branch circuit (9, 109, 209, 309, 509) supplying the first evaporator with refrigerant of a lower quality value, X, than the quality value, X, of refrigerant supplied to the second evaporator, wherein the quality value X is between 0 and 1, indicating a gas-phase ratio of the refrigerant, the branch circuit (9, 109, 209, 309, 509) includes - a gas-liquid separator provided between the expansion device and the plurality of evaporators, - a main flow pipe having one end connected to the gas-liquid separator, and configured to supply liquid-phase refrigerant or two-phase gas-liquid refrigerant downstream, - a first branch pipe having one end connected to the main flow pipe, and an other end connected to the first evaporator, and - a second branch pipe having one end connected to the main flow pipe between the expansion device and a connection site between the main flow pipe and the first branch pipe, and an other end connected to the second evaporator, characterized in that the main flow pipe includes a vertical pipe part disposed in a vertical direction, the one end of the first branch pipe is connected to the vertical pipe part, and the one end of the second branch pipe is connected to the vertical pipe part at a position farther upstream in a refrigerant flow direction than a connection position between the vertical pipe part and the first branch pipe. - a compressor; - a condenser; - an expansion device; - a plurality of evaporators having different heat loads, the plurality of evaporators being connected in parallel between the expansion device and a suction side of the compressor, the plurality of evaporators comprising a first evaporator and a second evaporator having a smaller heat load than does the first evaporator; and - a branch circuit (9, 109, 209, 309, 509) provided between the expansion device and the plurality of evaporators, and configured to distribute refrigerant to each of the plurality of evaporators, - a gas-liquid separator provided between the expansion device and the plurality of evaporators, - a main flow pipe having one end connected to the gas-liquid separator, and configured to supply liquid-phase refrigerant or two-phase gas-liquid refrigerant downstream, - a first branch pipe having one end connected to the main flow pipe, and an other end connected to the first evaporator, and - a second branch pipe having one end connected to the main flow pipe between the expansion device and a connection site between the main flow pipe and the first branch pipe, and an other end connected to the second evaporator, characterized in that