The present invention pertains to a cleaning treatment apparatus and a cleaning treatment method. The cleaning treatment apparatus cleans, in a cleaning vessel (5), an object to be cleaned (W) having a tubular part (2) and a main body part (3) linked to one end of the tubular part (2). The cleaning treatment apparatus comprises the following: a cleaning solution supply unit (6) for pressurizing a cleaning solution and supplying the same to the cleaning vessel (5)； a through hole part (7) provided in the cleaning vessel (5) and having a through hole into which the tubular part (2) can be inserted； and an outlet hole part (8) provided in the cleaning vessel (5) and having an outlet hole for discharging the cleaning solution supplied to the cleaning vessel (5) and for adjusting the pressure of the cleaning solution in the cleaning vessel (5) to a predetermined pressure.本發明係關於洗淨處理裝置及洗淨處理方法。洗淨處理裝置係在洗淨容器(5)中洗淨被洗淨物(W)，該被洗淨物(W)具有管狀部(2)，及連接管狀部(2)之一端部之本體部(3)。洗淨處理裝置具備洗淨液供給部(6)，其將洗淨液加壓供給至洗淨容器(5)；貫通孔部(7)，其設置於洗淨容器(5)，具有可插通管狀部(2)之貫通孔；及流出孔部(8)，其設置於洗淨容器(5)，具有流出孔，用於使供給至洗淨容器(5)內之洗淨液流出，從而將洗淨容器(5)內之洗淨液調整成預先規定之壓力。
