A container refrigeration apparatus includes a CA system which controls the composition of the air in the container. The CA system includes a gas supply device which supplies nitrogen-enriched air, an intake duct which guides outside air to a first space on a suction side of an interior fan, and an exhaust duct which guides air in a second space on the blowout side of the interior fan out of a container. The exhaust duct has an inlet at a location where the flow of the air blown from the interior fan is blocked by a fan housing.
