An air-conditioning apparatus comprising: a controller; a heat source device including a compressing device that compresses a refrigerant, and a heat-source-side heat exchanger that exchanges heat between the refrigerant and outdoor air; an indoor unit (B, C) including an indoor heat exchanger that exchanges heat between conditioned air and the refrigerant, and expansion means; a refrigerant pipe (106, 107) that connects the heat source device and the indoor unit (B, C) to each other and forms a refrigerant circuit; a first injection pipe allowing a part of the refrigerant, as discharged from the compressing device, to flow into an intermediate portion of a compression stroke of the compressing device; a first injection flow control device that controls an amount of refrigerant passing through the first injection pipe; and an injection internal heat exchanger that exchanges heat between a refrigerant stream that flows through the first injection pipe and a refrigerant stream that flows into the heat-source-side heat exchanger after passing through the indoor unit (B, C), characterised in that the air-conditioning apparatus further comprises: a second injection pipe allowing a part of the refrigerant that has flowed through the indoor unit (B, C) into the heat source device and is to flow into the heat-source-side heat exchanger to flow into the intermediate portion of the compression stroke of the compressing device; a second injection flow control device that controls an amount of refrigerant passing through the second injection pipe; and said controller is configured to control opening degrees of the first injection flow control device and the second injection flow control device if a temperature of the outdoor air is not more than a predetermined temperature, the controller is configured to control the opening degree of the second injection flow control device; and if the opening degree of the second injection flow control device is not less than a predetermined opening degree, the controller is configured to maximize the opening degree of the first injection flow control device. a controller; a heat source device including a compressing device that compresses a refrigerant, and a heat-source-side heat exchanger that exchanges heat between the refrigerant and outdoor air; an indoor unit (B, C) including an indoor heat exchanger that exchanges heat between conditioned air and the refrigerant, and expansion means; a refrigerant pipe (106, 107) that connects the heat source device and the indoor unit (B, C) to each other and forms a refrigerant circuit; a first injection pipe allowing a part of the refrigerant, as discharged from the compressing device, to flow into an intermediate portion of a compression stroke of the compressing device; a first injection flow control device that controls an amount of refrigerant passing through the first injection pipe; and an injection internal heat exchanger that exchanges heat between a refrigerant stream that flows through the first injection pipe and a refrigerant stream that flows into the heat-source-side heat exchanger after passing through the indoor unit (B, C), characterised in that the air-conditioning apparatus further comprises: a second injection pipe allowing a part of the refrigerant that has flowed through the indoor unit (B, C) into the heat source device and is to flow into the heat-source-side heat exchanger to flow into the intermediate portion of the compression stroke of the compressing device; a second injection flow control device that controls an amount of refrigerant passing through the second injection pipe; and said controller is configured to control opening degrees of the first injection flow control device and the second injection flow control device if a temperature of the outdoor air is not more than a predetermined temperature, the controller is configured to control the opening degree of the second injection flow control device; and if the opening degree of the second injection flow control device is not less than a predetermined opening degree, the controller is configured to maximize the opening degree of the first injection flow control device. a second injection pipe allowing a part of the refrigerant that has flowed through the indoor unit (B, C) into the heat source device and is to flow into the heat-source-side heat exchanger to flow into the intermediate portion of the compression stroke of the compressing device; a second injection flow control device that controls an amount of refrigerant passing through the second injection pipe; and said controller is configured to control opening degrees of the first injection flow control device and the second injection flow control device if a temperature of the outdoor air is not more than a predetermined temperature, the controller is configured to control the opening degree of the second injection flow control device; and if the opening degree of the second injection flow control device is not less than a predetermined opening degree, the controller is configured to maximize the opening degree of the first injection flow control device.