A brace for immobilization of the acromioclavicular joint in the shoulder comprising a sleeve (12) and a shoulder pressure pad (13), adapted to respectively intervene on the elbow and shoulder on the same side of the body, whether right or left, as well as comprising a front tensioning strap (14) and a rear tensioning strap (15), arranged vertically between the shoulder pressure pad (13) and a front side and rear side of said sleeve (12) respectively, in addition to strap retention members (16), positionable around the torso and under the arm opposite to the one being treated as well as a waistband (20) presenting retention means (21) for firmly positioning the free end of the arm being treated next to the waistband (20).
