A knee joint supporter comprising: a first anchor part which is woven in a band-shaped fabric having stretchability in a longitudinal direction as a main material and having a loop face of a touch fastener and which, in use, is fastened around the thigh of a wearer; a main body part which is a band-shaped fabric having stretchability in a longitudinal direction as a main material and is composed of a second anchor part which, in use, is disposed at least below the popliteal region of the wearer, a first supporting part which, in use, is disposed on one side from below a part corresponding to the patella of the wearer, and a second supporting part which, in use, is disposed on the other side of the part corresponding to the patella of the wearer to cross the first supporting part below the part corresponding to the patella of the wearer, wherein the first supporting part is provided on one end side of the main body part, the second supporting part is provided on the other end side of the main body part, and the second anchor part is provided between the first supporting part and the second supporting part; connection parts which are joined to the first anchor part and the second anchor part, thereby integrating the first anchor part and the main body part; a first engaging part which is joined to an end portion of the second supporting part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part; a second engaging part which is joined to one end or the other end of the first anchor part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part; and a third engaging part which is joined to an end portion of the first supporting part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part. a first anchor part which is woven in a band-shaped fabric having stretchability in a longitudinal direction as a main material and having a loop face of a touch fastener and which, in use, is fastened around the thigh of a wearer; a main body part which is a band-shaped fabric having stretchability in a longitudinal direction as a main material and is composed of a second anchor part which, in use, is disposed at least below the popliteal region of the wearer, a first supporting part which, in use, is disposed on one side from below a part corresponding to the patella of the wearer, and a second supporting part which, in use, is disposed on the other side of the part corresponding to the patella of the wearer to cross the first supporting part below the part corresponding to the patella of the wearer, wherein the first supporting part is provided on one end side of the main body part, the second supporting part is provided on the other end side of the main body part, and the second anchor part is provided between the first supporting part and the second supporting part; connection parts which are joined to the first anchor part and the second anchor part, thereby integrating the first anchor part and the main body part; a first engaging part which is joined to an end portion of the second supporting part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part; a second engaging part which is joined to one end or the other end of the first anchor part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part; and a third engaging part which is joined to an end portion of the first supporting part and has a hook face of a touch fastener, which, in use, is detachably stuck to the loop face of the first anchor part.