Correct positioning of a double-lumen endobronchial tube (DLT) is essential for adequate ventilation, oxygenation, and lung separation during one-lung anesthesia. The displacement of a DLT by surgical manipulation, coughing, movements, or patient position changes have been reported. We experienced displacement of a left-sided DLT into the right bronchus during hilar dissection for carina sleeve right upper lobectomy in a 60-yr-old male patient. We emphasize the possibility of DLT dislocation during hilar dissection, so careful attention must be carried.