21-year-old man was admitted to the Department of Orthopaedic Surgery, Kyushu University with a 3 year old history of pain and bulging out of the sternum. A marked balooned out cystic lesions of the corpus sterni was demonstrated. Giant cell tumor Type II was confirmed on histological examination.After en bloc resection of the corpus sterni including both II, III, IV costosternal joints and lower part of manubrium. Three pieces of big iliac grafts were fixed to cover the defect as reconstruction operation.Six months postoperatively, roentgenograms were satisfactory with evidence of bony barrier formation. The patient's course continued to be satisfactory.