A refrigerating and air-conditioning apparatus comprising: multiple refrigeration cycles each including a compressor (1a, 1b), a four-way valve (2a, 2b), an indoor heat exchanger, a pressure reducing device (4a, 4d), and an outdoor heat exchanger (3a, 3b) which are connected by a pipe, each refrigeration cycle being configured to be capable of performing a cooling operation and a heating operation; an outdoor fan configured to send air for heat exchange with the outdoor heat exchangers (3a, 3b) of the refrigeration cycles; multiple indoor fans (6a, 6b) arranged corresponding to the respective indoor heat exchangers (5a, 5b) of the refrigeration cycles, each indoor fan (6a, 6b) being configured to create air flow to be sent through the respective indoor heat exchanger (5a, 5b) to an air-conditioning target space; a controller configured to, when at least one of the refrigeration cycles starts a defrosting operation for defrosting using the outdoor heat exchanger (3a, 3b) of the at least one of the refrigeration cycles as a condenser during the heating operation performed by the refrigeration cycles, control a capacity of the compressor (1a, 1b) of the at least one refrigeration cycle performing the defrosting operation such that a refrigerant condensing temperature in the outdoor heat exchanger (3a, 3b) of the at least one refrigeration cycle performing the defrosting operation reaches a predetermined temperature or higher; and characterized in that the refrigerating and air-conditioning apparatus further comprises air velocity detecting means (15a, 15b) for detecting a velocity of airflow of outside air, wherein when the at least one of the refrigeration cycles starts the defrosting operation, the controller controls a rotation speed of the outdoor fan depending on the velocity of airflow associated with detection by the air velocity detecting means (15a, 15b). multiple refrigeration cycles each including a compressor (1a, 1b), a four-way valve (2a, 2b), an indoor heat exchanger, a pressure reducing device (4a, 4d), and an outdoor heat exchanger (3a, 3b) which are connected by a pipe, each refrigeration cycle being configured to be capable of performing a cooling operation and a heating operation; an outdoor fan configured to send air for heat exchange with the outdoor heat exchangers (3a, 3b) of the refrigeration cycles; multiple indoor fans (6a, 6b) arranged corresponding to the respective indoor heat exchangers (5a, 5b) of the refrigeration cycles, each indoor fan (6a, 6b) being configured to create air flow to be sent through the respective indoor heat exchanger (5a, 5b) to an air-conditioning target space; a controller configured to, when at least one of the refrigeration cycles starts a defrosting operation for defrosting using the outdoor heat exchanger (3a, 3b) of the at least one of the refrigeration cycles as a condenser during the heating operation performed by the refrigeration cycles, control a capacity of the compressor (1a, 1b) of the at least one refrigeration cycle performing the defrosting operation such that a refrigerant condensing temperature in the outdoor heat exchanger (3a, 3b) of the at least one refrigeration cycle performing the defrosting operation reaches a predetermined temperature or higher; and characterized in that the refrigerating and air-conditioning apparatus further comprises air velocity detecting means (15a, 15b) for detecting a velocity of airflow of outside air, wherein when the at least one of the refrigeration cycles starts the defrosting operation, the controller controls a rotation speed of the outdoor fan depending on the velocity of airflow associated with detection by the air velocity detecting means (15a, 15b).