Abstract: A gas refrigerant separator-cum-refrigerant flow divider includes an inlet chamber having a circular cross section, a speed increasing chamber having a circular cross section, and an outlet chamber having a circular cross section, which are coaxially arranged in series. The outlet chamber introduces refrigerant from a refrigerant inlet port and guides and swirls the refrigerant along an inner wall surface of the outlet chamber. The speed increasing chamber increases the speed of a swirling refrigerant flow sent from the inlet chamber and jets the swirling refrigerant flow into the outlet chamber through a communication port, which is formed at the distal end of the speed increasing chamber. The diameter of the outlet chamber is greater than the diameter of the communication port at the distal end of the speed increasing chamber. The gas refrigerant separator-cum-refrigerant flow divider further has a gas refrigerant extracting pipe.