Provided is a refrigeration device in which it is easy to ensure heating capability and suppress noise generated at the time of returning to heating operation. This air conditioner (1), which is a refrigeration device, comprises, in a refrigerant circuit (10): a compressor (11); an outdoor heat exchanger (13) that functions as an evaporator during heating operation; an indoor heat exchanger (16) that functions as a condenser during heating operation; and a four-way switching valve (12). The refrigerant circuit (10) is configured such that the high-pressure value of the refrigerant circuit (10) during defrosting operation is lower than the high-pressure value of the refrigerant circuit (10) during heating operation. The compressor (11) is set such that the defrosting-end-time frequency reduction rate, which is the rate of reduction in the operation frequency of the compressor (11) during defrosting operation, is higher than the normal frequency reduction rate, which is the rate of reduction in the operation frequency of the compressor (11) during heating operation.