A container refrigeration apparatus which includes a refrigerant circuit configured to be attached to a container, which is configured to store breathing plants, and to perform a refrigeration cycle to cool air in the interior of the container, the container refrigeration apparatus comprising: first and second adsorbers and each provided with an adsorbent adsorbing nitrogen in the air; a pressurization portion which pressurizes one of the first and second adsorbers and by supplying the one adsorber with the air to perform an adsorption operation of adsorbing nitrogen in the air onto the associated adsorbent; a depressurization portion which depressurizes the other of the first and second adsorbers and by sucking the air from the other adsorber to perform a desorption operation of desorbing nitrogen from the associated adsorbent; switchers (32, 33) which alternately switch between a first operation state where the depressurization portion sucks the air from the second adsorber while the pressurization portion supplies the air to the first adsorber, and a second operation state where the depressurization portion sucks the air from the first adsorber while the pressurization portion supplies the air to the second adsorber; a supplier which is is configured to supply the interior of the container with a gas mixture including nitrogen desorbed from the adsorbent; and a casing configured to form an internal storage space connected to the interior of the container, and an external storage space connected to the exterior of the container, wherein the refrigerant circuit comprises a compressor, a condenser, an expansion valve and an evaporator, the compressor, the condenser of the refrigerant circuit and an exterior fan, which is configured to send air in the exterior of the container to the condenser, being arranged in the external storage space, the evaporator and interior fans, which are configured to blow air into the evaporator, being arranged in the internal storage space and configured to cool the air in the container, the first and second adsorbers and, the pressurization portion, and the depressurization portion are disposed in the external storage space. first and second adsorbers and each provided with an adsorbent adsorbing nitrogen in the air; a pressurization portion which pressurizes one of the first and second adsorbers and by supplying the one adsorber with the air to perform an adsorption operation of adsorbing nitrogen in the air onto the associated adsorbent; a depressurization portion which depressurizes the other of the first and second adsorbers and by sucking the air from the other adsorber to perform a desorption operation of desorbing nitrogen from the associated adsorbent; switchers (32, 33) which alternately switch between a first operation state where the depressurization portion sucks the air from the second adsorber while the pressurization portion supplies the air to the first adsorber, and a second operation state where the depressurization portion sucks the air from the first adsorber while the pressurization portion supplies the air to the second adsorber; a supplier which is is configured to supply the interior of the container with a gas mixture including nitrogen desorbed from the adsorbent; and a casing configured to form an internal storage space connected to the interior of the container, and an external storage space connected to the exterior of the container, wherein the refrigerant circuit comprises a compressor, a condenser, an expansion valve and an evaporator, the compressor, the condenser of the refrigerant circuit and an exterior fan, which is configured to send air in the exterior of the container to the condenser, being arranged in the external storage space, the evaporator and interior fans, which are configured to blow air into the evaporator, being arranged in the internal storage space and configured to cool the air in the container, the first and second adsorbers and, the pressurization portion, and the depressurization portion are disposed in the external storage space.