A shoulder brace for non-surgical treatment that is capable of immobilizing an upper arm of a patient having acromioclavicular joint dislocation or a distal clavicle fracture. The brace enables activities of daily living for the patient and relieves uneasiness/discomfort. The shoulder brace includes a strap utilized for reduction, the strap forming a loop made in series by a section which runs down vertically from the front of the acromioclavicular joint toward the ulnar side of the forearm, a section which runs across a forearm trough, a section which runs up from the radial side of the forearm windingly across the front of the upper arm to the back of the shoulder, and a section which runs across from the back to the front over the shoulder pad and reaches to the acromioclavicular joint part. The shoulder brace is fitted to a patient in the extremity position where the upper arm hangs down, and the strap runs crossly or twistingly to stably retain the reduction.
