An air-conditioning apparatus 100 includes a refrigeration cycle charged with non-azeotropic refrigerant mixture and refrigerating machine oil. A suction pipe 21 which is a refrigerant pipe connecting between a suction port of a compressor 1 and an accumulator 2 has an end portion on the side of the accumulator 2 extending into the accumulator 2. In addition, the suction pipe 21 of the air-conditioning apparatus 100 includes an oil return hole 19 formed in a portion of the suction pipe 21 located inside the accumulator 2 at a position higher than a central portion of the accumulator 2. A controller 16 of the air-conditioning apparatus 100 controls an opening degree of a pressure reducing device 4 so as to make quality of refrigerant flowing into the accumulator 2 less than 1.