An air-conditioning apparatus (100, 200, 300, 400, 500, 600) including an outdoor unit and a plurality of indoor units (C, D, E) connected in parallel to the outdoor unit comprising: - a controller adapted to control the operation of the air-conditioning apparatus (100, 200, 300, 400, 500, 600), an injection pipe; - a compressor into which an intermediate-pressure refrigerant is allowed to be injected via the injection pipe in the course of compressing a refrigerant; - an outdoor heat exchanger; - a flow passage switching device that is adapted to switch a connection of the outdoor heat exchanger; - an injection flow rate control device that is adapted to control a flow rate of injection into the compressor; - an outdoor-side flow rate control device that is adapted to generate an intermediate pressure for injection into the compressor; a bypass pipe which allows bypassing of the outdoor heat exchanger; - a bypass flow rate control device that is placed at the bypass pipe; - an indoor heat exchanger provided within each indoor unit (C, D, E); and - an indoor-side flow rate control device that is provided within each indoor unit (C, D, E) and is adapted to adjust a flow rate of refrigerant to the indoor heat exchanger, - wherein the compressor, the outdoor heat exchanger, the flow passage switching device, the injection flow rate control device, the outdoor-side flow rate control device, and the bypass flow rate control device are provided within the outdoor unit, characterized in that the bypass pipe allows bypassing of the outdoor heat exchanger in parallel to the outdoor-side flow rate control device and the bypass flow rate control device is adapted to control an amount of heat exchange of the outdoor heat exchanger, together with the outdoor-side flow rate control device, - wherein in accordance with a specific condition, the controller is configured to switch between control of the amount of heat exchange of the outdoor heat exchanger by the outdoor-side flow rate control device and the bypass flow rate control device, and control of the flow rate of injection into the compressor by the outdoor-side flow rate control device, the bypass flow rate control device, and the injection flow rate control device. - a controller adapted to control the operation of the air-conditioning apparatus (100, 200, 300, 400, 500, 600), an injection pipe; - a compressor into which an intermediate-pressure refrigerant is allowed to be injected via the injection pipe in the course of compressing a refrigerant; - an outdoor heat exchanger; - a flow passage switching device that is adapted to switch a connection of the outdoor heat exchanger; - an injection flow rate control device that is adapted to control a flow rate of injection into the compressor; - an outdoor-side flow rate control device that is adapted to generate an intermediate pressure for injection into the compressor; - a bypass flow rate control device that is placed at the bypass pipe; - an indoor heat exchanger provided within each indoor unit (C, D, E); and - an indoor-side flow rate control device that is provided within each indoor unit (C, D, E) and is adapted to adjust a flow rate of refrigerant to the indoor heat exchanger, - wherein the compressor, the outdoor heat exchanger, the flow passage switching device, the injection flow rate control device, the outdoor-side flow rate control device, and the bypass flow rate control device are provided within the outdoor unit, - wherein in accordance with a specific condition, the controller is configured to switch between