An air-conditioning device (1) has a refrigerant circuit (10) in which a compressor (21), a four-path switching valve (22), an outdoor heat exchanger (23), an expansion valve (24), and an indoor heat exchanger (41) are connected. The outdoor heat exchanger (23) uses a flat perforated tube as a heat transfer tube (231). The air-conditioning device (1) switches the four-path switching valve (22) from a heating cycle state to a cooling cycle state when stopping the heating operation, stops the compressor (21), and carries out pressure equalization control to equalize the pressure in the refrigerant circuit (10).
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