Aneurysms of the subclavian artery are rare in comparison with other peripheral aneurysm. Most of these aneurysms arise from atherosclerosis, thoracic outlet obstruction, or trauma. We have experienced two cases of false aneurysms occurring the subclavian artery. One was occurred in right subclavian artery distal to right thyrocervical trunk due to trauma [falling] and was corrected with resection of the aneurysm and replacement with right external jugular vein. The other was occurred in the left subclavian artery lateral to the left internal mammary artery with complication of left hemothorax probably due to infection and was corrected with resection of aneurysm and replacement with Dacron graft. Postoperative course of both were uneventful without complication.