A container refrigeration apparatus installed in a container which houses respiring plants, the container refrigeration apparatus comprising: a refrigerant circuit in which a compressor, a condenser, an expansion mechanism, and an evaporator are connected together to perform a refrigeration cycle; a casing which is provided at an open end of the container, and forms an internal storage space housing the evaporator and communicating with the interior of the container; and an interior fan which is provided in the internal storage space, and circulates air between the interior of the container and the internal storage space, wherein the container refrigeration apparatus further comprises an inside air control system which controls the composition of the air in the container, the inside air control system including: a gas supply device which supplies nitrogen-enriched air having a higher nitrogen concentration than outside air to the internal storage space; an intake passage which allows a first space on the suction side of the interior fan in the internal storage space to communicate with the exterior of the container so that the outside air is guided into the first space; and an exhaust passage which allows a second space on the blowout side of the interior fan in the internal storage space to communicate with the exterior of the container so that the air in the second space is guided to the exterior of the container, and a plate member which forms, in the second space, a region where the flow of the air blown from the interior fan is blocked, and the exhaust passage has an inlet at a location where the flow of the air blown from the interior fan is blocked by the plate member. a refrigerant circuit in which a compressor, a condenser, an expansion mechanism, and an evaporator are connected together to perform a refrigeration cycle; a casing which is provided at an open end of the container, and forms an internal storage space housing the evaporator and communicating with the interior of the container; and an interior fan which is provided in the internal storage space, and circulates air between the interior of the container and the internal storage space, wherein the container refrigeration apparatus further comprises an inside air control system which controls the composition of the air in the container, the inside air control system including: a gas supply device which supplies nitrogen-enriched air having a higher nitrogen concentration than outside air to the internal storage space; an intake passage which allows a first space on the suction side of the interior fan in the internal storage space to communicate with the exterior of the container so that the outside air is guided into the first space; and an exhaust passage which allows a second space on the blowout side of the interior fan in the internal storage space to communicate with the exterior of the container so that the air in the second space is guided to the exterior of the container, and a plate member which forms, in the second space, a region where the flow of the air blown from the interior fan is blocked, and an inside air control system which controls the composition of the air in the container, the inside air control system including: a gas supply device which supplies nitrogen-enriched air having a higher nitrogen concentration than outside air to the internal storage space; an intake passage which allows a first space on the suction side of the interior fan in the internal storage space to communicate with the exterior of the container so that the outside air is guided into the first space; and an exhaust passage which allows a second space on the blowout side of the interior fan in the internal storage space to communicate with the exterior of the container so that the air in the second space is guided to the exterior of the container, and a plate member which forms, in the second space, a region where the flow of the air blown from the interior fan is blocked, and the exhaust passage has an inlet at a location where the flow of the air blown from the interior fan is blocked by the plate member.