PROBLEM TO BE SOLVED: To provide an ankle foot orthosis in which a damper does not need to oscillate.SOLUTION: The ankle foot orthosis 10 includes a lower thigh member 12 worn around the lower thigh of a user, a foot member 14 worn around the foot of the user, the damper 40, and a coupling mechanism 20. The foot member 14 is oscillatably coupled with the lower thigh member 12. The damper 40 provides viscosity elastic by a movable end moving. The damper 40 is fixed to the lower thigh member 12, and the movable end moves along the lower thigh in the longitudinal direction when the lower thigh member 12 is worn by the user. The coupling mechanism 20 couples the foot member 14 to the movable end of the damper 40. The coupling mechanism 20 moves the movable end of the damper 40 interlocking with the oscillation of the foot member 14.COPYRIGHT: (C)2011,JPO&INPIT【課題】ダンパが揺動する必要のない短下肢装具を提供する。【解決手段】短下肢装具10は、ユーザの下腿に装着される下腿部材12と、ユーザの足に装着される足部材14と、ダンパ40と連結機構20を備える。足部材14は、下腿部材12に揺動可能に連結されている。ダンパ40は、可動端が動くことによって粘性抵抗を付与する。ダンパ40は、下腿部材12に固定されており、下腿部材12がユーザに装着されたときに可動端が下腿の長手方向に沿って動く。連結機構20は、足部材14をダンパ40の可動端に連結する。連結機構20は、足部材14の揺動に連動してダンパ40の可動端を動かす。【選択図】図1