The statistical study was done on 455 cases of the foreign bodies in the food and air passages, who visited the Dept. of Otolaryng. Of S.N.U.H. and treated endoscopically form Jan. 1960 to Sep. 1970. The results were as follows, 1) The total numbers of the foreign bodies were 455 cases, 388 cases were the foreign bodies of the food passage and 67 cases were the air passages. The ratio between the food passage and the air passages was about 5.8 : 1. 2) 269 cases (59.1%) were males and 186 cases (40.9%) were females, and the ratio between males and females was 1.4 :1. Meat and food particles in the esophagus were more frequent in females. 3) The frequent foreign bodies in the esophagus were coin, bone and meat & food particles in order. Bean and peanut were the most frequent foreign bodies in the air passages. 4) 291 cases (64.0%) of all foreign bodies were under 5 years of age, especially, coin 96.5%. 5) In the location of the foreign bodies of the food passage, 340 cases(87.8%) were in the first esophageal narrowing. Among these, 224 cases(65.9%) were coin cases. Meat and food particles were lodged in the 2nd and 3rd narrowing frequently. In the air passage, the frequent sites were the bronchus, trachea and larynx in order, and in the bronchus right side foreign bodies were more frequent in 2.4 times of left side. 6) 223 cases (57.7%) of foreign bodies of food passages were removed within 24 hours, 79.6% was removed within 72 hours. The number of cases lodged within 24 hours was 49.33% and 34.3% was removed within more than one week in the air passage. 7) The most common cause was ignorance, and esophageal foreign bodies were extracted by esophagoscopy and laryngeal foreign bodies by laryngoscopy under the local anesthesia. Tracheal and bronchial foreign bodies were extracted by bronchoscopy under the general or local anesthesia. 8) In esophagoscopy, granulation tissues were noted in 7 cases due to foreign bodies. Nine cases of complications were encountered in the foreign bodies of the air passage, and among them two patients were expired.