The purpose of the present invention is to inhibit a reduction in efficiency and reduce the pipe diameter of connection pipes while a refrigerant having a low global warming potential (GWP) is used. A refrigerating cycle device is composed of a compressor (1), a heat source equipment-side heat exchanger (3), a first expansion device (4), a liquid-side connection pipe (7), a second expansion device (21), a usage-side heat exchange (22), and a gas-side connection pipe (8), the preceding being connected in the stated order. Also, the refrigerant used in the refrigerating cycle is R32, the outside diameter of the liquid-side connection pipe and the gas-side connection pipe is "(D0-1) / 8 inches" (wherein "D0 / 8 inches" is the outside diameter of the connection pipe when refrigerant R410A is used), the range of D0 is "2<=D0<=4" in the liquid connection pipe, and the range of D0 is "3<=D0<=8" in the gas connection pipe.