Disclosed is a container refrigeration apparatus including a unit case (36) of an inside air control system (60) disposed outside a container, the unit case (36) housing an air pump (31) therein. The container refrigeration apparatus is provided with an air inlet unit (75) independent of the unit case (36). The air inlet unit (75) and the air pump (31) are connected together by a tube. The air inlet unit (75) is provided with a membrane filter (76), and is disposed above the unit case (36). Malfunctions of electrical components and corrosion on metallic components due to moisture permeation into the unit case (36) are reduced.
