The invention provides a knee stabilizing brace which is usable regardless of a damaged portion of a ligament of a knee joint. The knee stabilizing brace includes a brace body which has a back-side body portion applied to a back side of a thigh, a poples, and a back side of a crus, and right and left front-side body portions, which are applied to a front side of the thigh, a kneecap, and a front side of the crus, right and left support stays for reinforcement, and upper and lower fastening bands for fastening the brace body 1 around a thigh portion, wherein the brace body is fitted around a knee portion by overlapping and engaging surface fasteners of the right and left front-side body portions, four ring-like fasteners are provided on upper, lower, right, and left sides of the back side of the back-side body portion, four engaging regions are set to upper, lower, right, and left sides of the right and left front-side body portions, and first and second fastening bands for patella which are detachably engaged into one of the four ring-like fasteners and one of the four engaging regions are provided.
