An air conditioner, comprising: a compressor, a condenser and an evaporator connected to form a refrigerating cycle; a receiver storing a portion of refrigerant for the refrigerating cycle; an accumulator configured to receive refrigerant from the receiver and refrigerant from the evaporator, and to separate a gas refrigerant from the refrigerant received therein and supply the gas refrigerant to the compressor; a bypass line connected between the receiver and the accumulator to supply refrigerant stored in the receiver to the accumulator, and a receiver suction tube connected to the receiver and guiding at least a portion of the refrigerant passing through the condenser to the receiver, wherein the receiver and the accumulator are integrally formed and defined within an interior space formed in a single housing which is divided by a partition wall disposed within the single housing into two spaces, the receiver includes a receiver body defining an outer appearance of the receiver, and a receiver cover covering a portion of the receiver body, the accumulator includes an accumulator body defining an outer appearance of the accumulator and an accumulator cover covering a portion of the accumulator body, wherein the receiver is disposed below the partition wall and the receiver cover is disposed on a lower end of the receiver body, wherein the accumulator is disposed above the partition wall, and the accumulator cover is disposed on an upper end of the accumulator body, wherein an outlet end of the bypass line is connected to an upper portion of the accumulator, wherein the outlet end of the bypass line extends through the accumulator cover positioned on a top of the accumulator to discharge refrigerant into an interior of the accumulator, wherein an inlet end of the bypass line extends through the receiver cover positioned on a bottom of the receiver to draw refrigerant from an interior of the receiver, wherein a first valve is provided in the receiver suction tube to control an amount of refrigerant suctioned into the receiver, and wherein a second valve is provided in the bypass line to control an amount of refrigerant supplied from the receiver to the accumulator. a compressor, a condenser and an evaporator connected to form a refrigerating cycle; a receiver storing a portion of refrigerant for the refrigerating cycle; an accumulator configured to receive refrigerant from the receiver and refrigerant from the evaporator, and to separate a gas refrigerant from the refrigerant received therein and supply the gas refrigerant to the compressor; a bypass line connected between the receiver and the accumulator to supply refrigerant stored in the receiver to the accumulator, and a receiver suction tube connected to the receiver and guiding at least a portion of the refrigerant passing through the condenser to the receiver, wherein the receiver and the accumulator are integrally formed and defined within an interior space formed in a single housing which is divided by a partition wall disposed within the single housing into two spaces, the receiver includes a receiver body defining an outer appearance of the receiver, and a receiver cover covering a portion of the receiver body, the accumulator includes an accumulator body defining an outer appearance of the accumulator and an accumulator cover covering a portion of the accumulator body, wherein the receiver is disposed below the partition wall and the receiver cover is disposed on a lower end of the receiver body, wherein the accumulator is disposed above the partition wall, and the accumulator cover is disposed on an upper end of the accumulator body, wherein an outlet end of the bypass line is connected to an upper portion of the accumulator, wherein the outlet end of the bypass line extends through the accumulator cover positioned on a top of the accumulator to discharge refrigerant into an interior of the accumulator, wherein an inlet end of the bypass line extends through the receiver cover positioned on a bottom of the receiver to draw refrigerant from an interior of the receiver, wherein a first valve is provided in the receiver suction tube to control an amount of refrigerant suctioned into the receiver, and wherein a second valve is provided in the bypass line to control an amount of refrigerant supplied from the receiver to the accumulator.