<p>A refrigeration circuit (110), a freezing circuit (120) and a booster circuit (130) are connected in parallel with an outdoor circuit (40). A closed circuit circulation passage through which a refrigerant delivered from a booster compressor (131) during a defrost operation flows to a freezing heat exchanger (121) and returns back to the booster compressor (131) is formed in the freezing circuit (120) and the booster circuit (130). A supercooling heat exchanger (150) for evaporating the refrigerant delivered from the freezing heat exchanger (121) during the defrost operation by exchanging heat with a refrigerant delivered from the outdoor circuit (40) is provided in the circulation passage.</p>
