PROBLEM TO BE SOLVED: To provide a leg joint mechanism capable of suppressing a discomfort which is felt by a user when a user adducts and abducts a leg joint.SOLUTION: A leg joint mechanism 20 comprises: a lower leg link 22 extended along a lower leg 16 of a user U a foot holding member 21 capable of holding a foot 8 of the user U a hinge mechanism 23 which forms a bottom dorsal flexion mechanism for connecting the lower leg link 22 and the foot holding member 21 so as to rotate around a bottom dorsal flexion shaft 11 of the leg joint 1 a second guide rail mechanism 30 which forms an adduct/abduct mechanism for connecting the lower leg link and the foot holding member so as to rotate around an adduct/abduct shaft 13 and a first guide rail mechanism 46 for connecting the lower leg link and the foot holding member so as to rotate around a return from an adduct/abduct shaft 14, serving as a return from adduct/abduct mechanism.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2019,JPO&INPIT【課題】使用者が足関節を回内外させた時に覚える違和感を抑制できる足関節機構を提供する。【解決手段】足関節機構20は、使用者Uの下腿16に沿って延びる下腿リンク22と、使用者Uの足8を保持可能な足保持部材21と、下腿リンク22と足保持部材21とを、足関節1の底背屈軸11まわりに回動可能に連結する底背屈機構をなすヒンジ機構23、内外転軸13まわりに回動可能に連結する内外転機構をなす第2ガイドレール機構30、及び内外がえし軸14まわりに回動可能に連結する内外がえし機構をなす第1ガイドレール機構46とを備える。【選択図】図4
