PROBLEM TO BE SOLVED: To provide a technique capable of more appropriately performing a pressurizing operation. A pressurizing device is a pressurizing device for increasing an internal pressure of a closed space and maintaining the internal pressure at a target atmospheric pressure. The pressurizing device includes an air supply device that supplies air into the closed space, and a control device. The control device operates the air supply device to increase the internal pressure, and when the starting condition for starting the pressurization operation for maintaining the internal pressure at the target pressure is satisfied, operates the air supply device. The pressurizing operation is started, and when the internal atmospheric pressure reaches the target atmospheric pressure after the start of the pressurizing operation and the external atmospheric pressure of the closed space becomes equal to the internal atmospheric pressure, the pressurizing operation is ended. [Selection diagram] Fig. 3【課題】加圧運転がより適切に実行され得る技術を提供する。【解決手段】加圧装置は、閉鎖空間の内部気圧を増加させ、内部気圧を目標気圧に維持するための加圧装置である。その加圧装置は、閉鎖空間内に空気を供給する空気供給装置と、制御装置と、を備えている。制御装置は、空気供給装置を動作させて内部気圧を増加させ、内部気圧を目標気圧に維持するための加圧運転を開始するための開始条件が満たされる場合に、空気供給装置を動作させて加圧運転を開始し、加圧運転の開始後、内部気圧が目標気圧に到達した後で、閉鎖空間の外部気圧が内部気圧と等しくなる場合に、加圧運転を終了する。【選択図】図３
