PROBLEM TO BE SOLVED: To provide a new orthosis which is worn from a lower leg to a foot and which can guide lower leg rotation during a walking motion. A lower leg rotation orthosis 100 according to the present invention includes a sole plate 120 provided with a pair of support side plates 110 upward from left and right edges, and a lower leg support 130 supported by a joint portion formed at a tip of the support side plate 110. A lower leg brace comprising: a lower leg cuff 140 fixed to the lower leg strut 130, wherein a joint shaft fixed to a joint member provided at a lower end of the lower leg strut 130 has one joint portion provided in a joint portion. The lower joint cuff 140 is rotatably supported by a dynamic bearing, and the other joint portion is supported by a triaxial rotation bearing provided in the joint portion. The lower leg cuff 140 is curved to allow bending. The portion 141 is provided to allow different rotation ranges on the left and right of the rotation bearing. [Selection diagram] Figure 1【課題】下腿部から足部にかけて装着し、歩行動作中の下腿回旋を誘導可能とする新たな装具を提供する。【解決手段】本発明の下腿回旋装具１００は、一対の支持側板１１０を左右縁から上向きに設ける足底板１２０と、支持側板１１０の先端に形成される継手部に支持される下腿支柱１３０と、下腿支柱１３０に固定される下腿カフ１４０と、を備える下腿装具であって、下腿支柱１３０の下端に設けた結合部材に固着した結合軸を、一方の継手部は、継手部に設けた前後回動軸受により回動可能に支持してなり、他方の継手部は、継手部に設けた３軸回動軸受により支持してなる構成とし、下腿カフ１４０は、しなりを可能とするための湾曲部１４１を備え、回動軸受の左右で異なる回動範囲を許容する。【選択図】図１
