A 69 years old, otherwise healthy male pt. was admitted and soheduled for subtotal gastrectomy under the Dx. of stornach Ca. The induction of anesthesia and beginning of Operation were smooth and unevntful. After peritoneal opening, the surgeon complained of distended stomach which was synch- ronous with ventilation. With repeating tracheogram and endoscopic examination, the authors fecund unsuspected tracheo-esophageal fistula on the low-middle esophagus. Durins convalescenee the pt, had not suffered any pulmonary complication.