Air conditioning apparatus

This air conditioning device 1 has the following two possible operations: a first parallel heating and defrosting operation in which hot gas discharged from a compressor 2 is supplied to a first heat source-side heat exchanger 6a by closing a first heat-source side decompression device 5a and opening a first electromagnetic valve 24, and in which a low temperature and low pressure two-phase refrigerant is supplied to a third heat source-side heat exchanger 6c by closing a second electromagnetic valve 26 and opening a third heat source-side decompression device 5c; and a second parallel heating and defrosting operation in which the low temperature and low pressure two-phase refrigerant is supplied to the first heat source-side heat exchanger 6a by closing the first electromagnetic valve 24 and opening the first heat source-side decompression device 5a, and in which the hot gas discharged from the compressor 2 is supplied to the third heat source-side heat exchanger 6c by closing the third heat source-side decompression device 5c and opening the second electromagnetic valve 26. The air conditioning device is provided with a control device 500 that, when the first parallel heating and defrosting operation or the second parallel heating and defrosting operation is executed, supplies the hot gas discharged from the compressor 2 to a second heat source-side heat exchanger 6b by closing a second heat source-side decompression device 5b, and opening a bypass decompression device 28 and adjusting the opening degree thereof.