An air-conditioning apparatus including a compressor, a load-side heat exchanger, an expansion unit, and a heat source-side heat exchanger connected to one another via a pipe to allow refrigerant to circulate, the air-conditioning apparatus comprising: a gas-liquid separator configured to separate the refrigerant; a bypass pipe connected between the gas-liquid separator and a suction side of the compressor; a bypass expansion unit provided to the bypass pipe and configured to adjust a flow rate of the refrigerant; a heat source-side expansion unit configured to adjust a flow rate of the refrigerant flowing into the heat source-side heat exchanger; a discharge pressure detection unit configured to detect a discharge pressure, a suction pressure detection unit configured to detect a suction pressure, an inflow pressure detection unit configured to detect an inflow pressure, an inflow temperature detection unit configured to detect an inflow temperature, and a controller configured to adjust an opening degree of the bypass expansion unit on a basis of a bypass flow rate of the refrigerant flowing through the bypass pipe calculated from an opening degree of the heat source-side expansion unit, an inflow flow rate of the refrigerant flowing into the gas-liquid separator, and an inlet quality of the gas-liquid separator, wherein, when the inflow pressure is denoted by P1, the suction pressure is denoted by P2, the flow path resistance obtained from the opening degree of the heat source-side expansion unit is denoted by Cv, the specific gravity is denoted by G, and the density is denoted by p, the bypass flow rate Grg can be obtained through the following equation: Grg = 17 ⋅ Cv ⋅ ρ ⋅ P 1 + P 2 ⋅ P 2 − P 1 1 / 2 / G 1 / 2, when the stroke volume of the compressor is denoted by Vst, the volume efficiency of the compressor is denoted by ηv, the frequency of the compressor is denoted by F, and the suction density of the compressor is denoted by ps, the inflow flow rate Gr can be obtained through the following equation: Gr = 3600 ⋅ Vst ⋅ η v ⋅ ρ s, and when enthalpy on an outlet side of the load-side heat exchanger calculated from the discharge pressure and the inflow temperature is denoted by ho, saturated liquid enthalpy calculated from the suction pressure is denoted by hl, and saturated gas enthalpy calculated from the suction pressure is denoted by hg, the inlet quality x is obtained through the following equation: x = ho − hl / hg − hl. a gas-liquid separator configured to separate the refrigerant; a bypass pipe connected between the gas-liquid separator and a suction side of the compressor; a bypass expansion unit provided to the bypass pipe and configured to adjust a flow rate of the refrigerant; a heat source-side expansion unit configured to adjust a flow rate of the refrigerant flowing into the heat source-side heat exchanger; a discharge pressure detection unit configured to detect a discharge pressure, a suction pressure detection unit configured to detect a suction pressure, an inflow pressure detection unit configured to detect an inflow pressure, an inflow temperature detection unit configured to detect an inflow temperature, and a controller configured to adjust an opening degree of the bypass expansion unit on a basis of a bypass flow rate of the refrigerant flowing through the bypass pipe calculated from an opening degree of the heat source-side expansion unit, an inflow flow rate of the refrigerant flowing into the gas-liquid separator, and an inlet quality of the gas-liquid separator, wherein, when the inflow pressure is denoted by P1, the suction pressure is denoted by P2, the flow path resistance obtained from the opening degree of the heat source-side expansion unit is denoted by Cv, the specific gravity is denoted by G, and the density is denoted by p, the bypass flow rate Grg can be obtained through the following equation: Grg = 17 ⋅ Cv ⋅ ρ ⋅ P 1 + P 2 ⋅ P 2 − P 1 1 / 2 / G 1 / 2, when the stroke volume of the compressor is denoted by Vst, the volume efficiency of the compressor is denoted by ηv, the frequency of the compressor is denoted by F, and the suction density of the compressor is denoted by ps, the inflow flow rate Gr can be obtained through the following equation: Gr = 3600 ⋅ Vst ⋅ η v ⋅ ρ s, and when enthalpy on an outlet side of the load-side heat exchanger calculated from the discharge pressure and the inflow temperature is denoted by ho, saturated liquid enthalpy calculated from the suction pressure is denoted by hl, and saturated gas enthalpy calculated from the suction pressure is denoted by hg, the inlet quality x is obtained through the following equation: x = ho − hl / hg − hl.