An air-conditioning apparatus comprising: - a refrigeration cycle including a compressor , a condenser, an expansion valve , an outdoor heat exchanger serving as an evaporator, and a liquid header connected to a position that is a refrigerant inflow side of the outdoor heat exchanger when the outdoor heat exchanger serves as the evaporator; - an outdoor fan configured to supply air to the outdoor heat exchanger , - the outdoor heat exchanger comprising heat transfer tubes , the outdoor heat exchanger being provided to a casing of an outdoor unit such that the heat transfer tubes are arranged in parallel in an up and down direction, - the air, sucked into the casing of the outdoor unit by the outdoor fan , being discharged from an upper portion of the casing after exchanging heat in the outdoor heat exchanger , - the liquid header being divided into a plurality of liquid header portions in the up and down direction, - each of the liquid header portions being configured to be connected with each of the heat transfer tubes of divided regions formed by dividing the outdoor heat exchanger in the up and down direction, - a first gas-liquid separator configured to separate two-phase refrigerant, flowing out of the expansion valve , into gas refrigerant and liquid refrigerant; - a bypass connecting the first gas-liquid separator and a suction side of the compressor , the bypass being configured to adjust an amount of the gas refrigerant, separated by the first gas-liquid separator , to be returned to the suction side of the compressor ; and - a shunt connecting the first gas-liquid separator and each of the liquid header portions , wherein the shunt is configured to supply the two-phase refrigerant, in which amount of gas refrigerant in the two-phase refrigerant is adjusted by the first gas-liquid separator , to each of the liquid header portions , and is configured to supply a larger amount of the two-phase refrigerant to one of the liquid header portions connected with the divided region of the upper portion of the outdoor heat exchanger having a larger air quantity, than another one of the liquid header portions connected with the divided region of the lower portion of the outdoor heat exchanger having a smaller air quantity. - a refrigeration cycle including a compressor , a condenser, an expansion valve , an outdoor heat exchanger serving as an evaporator, and a liquid header connected to a position that is a refrigerant inflow side of the outdoor heat exchanger when the outdoor heat exchanger serves as the evaporator; - an outdoor fan configured to supply air to the outdoor heat exchanger , - the outdoor heat exchanger comprising heat transfer tubes , the outdoor heat exchanger being provided to a casing of an outdoor unit such that the heat transfer tubes are arranged in parallel in an up and down direction, - the air, sucked into the casing of the outdoor unit by the outdoor fan , being discharged from an upper portion of the casing after exchanging heat in the outdoor heat exchanger , - the liquid header being divided into a plurality of liquid header portions in the up and down direction, - each of the liquid header portions being configured to be connected with each of the heat transfer tubes of divided regions formed by dividing the outdoor heat exchanger in the up and down direction, - a first gas-liquid separator configured to separate two-phase refrigerant, flowing out of the expansion valve , into gas refrigerant and liquid refrigerant; - a bypass connecting the first gas-liquid separator and a suction side of the compressor , the bypass being configured to adjust an amount of the gas refrigerant, separated by the first gas-liquid separator , to be returned to the suction side of the compressor ; and - a shunt connecting the first gas-liquid separator and each of the liquid header portions , <EOS>