This refrigeration cycle apparatus is provided with a compressor (1), an outdoor heat exchanger (2), an expansion valve (3) having open degree thereof controllable, and an indoor heat exchanger (4). The refrigeration cycle apparatus is also provided with: a bypass flow channel (11) that makes a cooling medium being compressed by means of the compressor bypass to the suction side of the compressor; a solenoid valve (12), which opens/closes the bypass flow channel; and a control unit (20), which controls capacity by adjusting the flow volume of the cooling medium to be discharged to the refrigeration cycle from the compressor by controlling a period of time when the solenoid valve is in the open state, and a period of time when the solenoid valve is in the closed state. The control unit performs control on the basis of a duty ratio, which is a ratio of an open period of time to a duty cycle, i.e., a sum of a period of time when the solenoid valve is opened, and a period of time when the solenoid valve is closed, and when, in the state where the solenoid valve is in the open state, suction pressure of the compressor becomes equal to or higher than an allowable deviation with respect to suction pressure before the solenoid valve is opened, the control unit controls the solenoid valve to be in the closed state, and determines the closed period of time on the basis of the duty ratio.