Bronchial foreign body is one of the most common cause of the lower airway obstruction in the pediatric age group and can produce different symptoms and signs, which may be confused with other disease. So, the accurate diagnosis and prompt treatment would be delayed and the prognosis is considered ad disastrous. Recently, we experienced a case of plastic foreign body lodged at the entrance of the right lower bronchus, which resulted in atelectasis in the right lower lung field in chest X-ray examination. It was possible to remove the smooth plastic foreign body after diode-laser vaporization of the surface under the ventilating bronchoscopy without complication.