A 47-year-old maIe, who had been treated under the diagnosis of bronchial asthma, was admitted to this department with the complaints of progressive dyspnea of 3 years duration and upper air way obstruction causing unique stridor. Through roentgenography and bronchoscopy, lower tracheal hamartoma was confirmed, but a pulmonary function test precipitated acute hypoxia with mental somnolence. The tumor was removed as quickly as possible by multiple punch biopsy, through a rigid bronchoscope, for life saving air way maintenance.