An air conditioner comprising a compressor, a condenser, an evaporator, a receiver for storing at least one portion of a refrigerant passing through the condenser and a gas/liquid separator for filtering a liquid refrigerant of the refrigerant introduced from the receiver to supply a gaseous refrigerant into the compressor, the air conditioner comprising: a first flow rate regulator for controlling the amount of refrigerant supplied into the receiver; a second flow rate regulator for controlling the amount of refrigerant introduced from the receiver into the gas/liquid separator; a bypass line allowing the receiver and the gas/liquid separator to communicate with each other, wherein the second flow rate regulator is disposed in the bypass line; a first detection unit for detecting the amount of refrigerant stored in the receiver; and a control unit for controlling an opening degree of the first or second flow rate regulator (261, 262), based on information of at least one of the amount of refrigerant detected by the first detection unit and the amount of refrigerant circulating in the air conditioner, wherein the air conditioner further comprises: a refrigerant storage part defining the receiver; a refrigerant separation part defining the gas/liquid separator; and at least one wall arranged between the refrigerant storage part and the refrigerant separation part, characterised in that the refrigerant storage part and the refrigerant separation part are integrally manufactured in a refrigerant storage unit for storing the refrigerant circulating in the air conditioner, and in that the refrigerant storage unit comprises: a partition part for partitioning the refrigerant storage part from the refrigerant separation part, the partition part comprising the at least one wall. a first flow rate regulator for controlling the amount of refrigerant supplied into the receiver; a second flow rate regulator for controlling the amount of refrigerant introduced from the receiver into the gas/liquid separator; a bypass line allowing the receiver and the gas/liquid separator to communicate with each other, wherein the second flow rate regulator is disposed in the bypass line; a first detection unit for detecting the amount of refrigerant stored in the receiver; and a control unit for controlling an opening degree of the first or second flow rate regulator (261, 262), based on information of at least one of the amount of refrigerant detected by the first detection unit and the amount of refrigerant circulating in the air conditioner, wherein the air conditioner further comprises: a refrigerant storage part defining the receiver; a refrigerant separation part defining the gas/liquid separator; and at least one wall arranged between the refrigerant storage part and the refrigerant separation part, characterised in that the refrigerant storage part and the refrigerant separation part are integrally manufactured in a refrigerant storage unit for storing the refrigerant circulating in the air conditioner, and in that the refrigerant storage unit comprises: a partition part for partitioning the refrigerant storage part from the refrigerant separation part, the partition part comprising the at least one wall. a refrigerant storage part defining the receiver; a refrigerant separation part defining the gas/liquid separator; and at least one wall arranged between the refrigerant storage part and the refrigerant separation part, characterised in that the refrigerant storage part and the refrigerant separation part are integrally manufactured in a refrigerant storage unit for storing the refrigerant circulating in the air conditioner, and in that the refrigerant storage unit comprises: a partition part for partitioning the refrigerant storage part from the refrigerant separation part, the partition part comprising the at least one wall.