A 3-year-old boy complaining of snoring and dyspnea was admitted to our hospital because of a giant pendulous tonsil in the upper pole of the left tonsil. Tonsillectomy was scheduled on his left side under general anesthesia. However, the big pendulous tonsil disturbed the tracheal intubation, and temporary ventilatory failure occurred. Histological diagnosis revealed tonsil-like tissue. Infantile cases of big pendulous tonsils disturbing tracheal intubation have rarely been reported, and we believe that a sufficient pre-operative plan should be made in order to avoid anesthesiologic trouble in such cases.