Refrigeration device for container

A container refrigeration apparatus comprising:

• a refrigerant circuit including a radiator and an evaporator and performing a refrigeration cycle;
• an exterior fan configured to supply air outside a container to the radiator;
• an interior fan configured to supply air inside the container to the evaporator;
• and
• a gas supply device configured to produce nitrogen-enriched air having a higher nitrogen concentration than outside air does, and to supply the nitrogen-enriched air into the container,
• the gas supply device including:
• a unit case disposed outside the container and having a cooling air inlet port and a cooling air outlet port;
• a pump mechanism housed in the unit case and configured to suck, and compress, outside air;
• and
• a generator configured to produce the nitrogen-enriched air from the compressed air discharged by the pump mechanism, wherein
• the container refrigeration apparatus has an exhaust passage through which the unit case and a space on a suction side of the exterior fan are connected together such that the exterior fan sucks air through the cooling air outlet port out of the unit case.