The intramedullary nailing for the humerus fracture has been used in selected cases of diaphyseal fracture and nonunion. However, with modern technical improvements, the idications could be expanded considerably. We treated various types of humerus fracture, which were previously unsuitable for Ender nailing. Between June 1989 and October 1991, Ender nailings were performed for 32 cases of surgical neck and diaphyseal fractures, and among those cases 19 cases were followed for more than 1 year. The results were as follows;l. Among 19 cases, semi-open reduction and Ender nailing with the addition of cancellous bone graft was done in 7 cases of surgical neck comminuted and 3 of diaphysis comminuted or segmental fractures. The remaining 9 cases were treated by closed reduction and Ender nailing. 2. Ender nails were inserted through retrograde entry in all cases. 3. Complications developed in 6 cases;one entry hole breakage, one transient radial nerve palsy, joint stiffnees of two shoulders and one elbow, and nonunion. 4. The mean duration of radiologic solid periosteal callus bridge formation was postoperative 8.5 weeks in surgical neck and diaphyseal fractures. 5. Excellent and good results rated by Stewart and Hundly were 15 (78%) cases in surgical neck and diaphyseal fracture.