PROBLEM TO BE SOLVED: To provide an inside air adjustment device capable of lowering an oxygen concentration while maintaining the carbon dioxide concentration of the inside air at a target carbon dioxide concentration, and a refrigeration device for container including the same.SOLUTION: A CA device (60) includes: a gas supply device (30) for performing a gas supply operation for supplying nitrogen concentration air to the inside of a container (11)； and a control part (55) for controlling the gas supply operation so that the composition of the inside air becomes a desired composition. The control part (55) is constituted to execute carbon dioxide priority control in which, when the oxygen concentration of the inside air is equal to or higher than a predetermined upper limit concentration which is higher than a target oxygen concentration, it performs the gas supply operation, and when the carbon dioxide concentration of the inside air drops to a limit concentration which is lower than the target carbon dioxide concentration, it stops the gas supply operation, and when the carbon dioxide concentration of the inside air has reaches a resumption concentration higher than the target carbon dioxide concentration by the respiration of plants, it resumes the gas supply operation.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT【課題】庫内空気の二酸化炭素濃度を目標二酸化炭素濃度に維持しながら酸素濃度を低下させることができる庫内空気調節装置及びそれを備えたコンテナ用冷凍装置を提供する。【解決手段】窒素濃縮空気をコンテナ（11）の庫内に供給するガス供給動作を行うガス供給装置（30）と、庫内空気の組成が所望の組成になるようにガス供給動作を制御する制御部（55）とを備えたＣＡ装置（60）において、制御部（55）を、庫内空気の酸素濃度が目標酸素濃度よりも高い所定の上限濃度以上であるときに、ガス供給動作を行って庫内空気の二酸化炭素濃度が目標二酸化炭素濃度より低い限界濃度まで低下すると、ガス供給動作を停止し、植物の呼吸によって庫内空気の二酸化炭素濃度が目標二酸化炭素濃度より高い再開濃度に到達すると、ガス供給動作を再開する二酸化炭素優先制御を実行するように構成する。【選択図】図４
