The disclosure relates to an ankle foot orthosis including a foot plate, a calf part and a first pivoting mechanism. The first pivoting mechanism includes a first connecting part, a second connecting part, and a pin. The first connecting part is connected to the foot plate. The second connecting part is connected to the calf part. The first connecting part has an engagement portion. The second connecting part has a groove and an opening connected to the groove. The engagement portion is engaged into the groove so that the first connecting part is pivotably engaged with the second connecting part, allowing the calf part to be pivotally connected to the foot plate. The pin is detachably disposed on the first connecting part. The second connecting part has a first stopping portion and a second stopping portion spaced apart from each other in order to limit the movement range of the pin. The first pivoting mechanism has a first detachable state. When the first pivoting mechanism is in the first detachable state, the engagement portion is located at the opening so that the engagement portion is allowed to be detached from the groove via the opening.本發明涉及一種踝足矯型器，包含腳板穿戴件、小腿穿戴件、第一與第二連接部及插銷結構。第一連接部連接腳板穿戴件。第二連接部連接小腿穿戴件。第一連接部具有嵌合結構，第二連接部具有滑槽與連接滑槽的缺口。嵌合結構位於滑槽使得第一連接部可樞轉地卡合於第二連接部，從而將小腿穿戴件樞設於腳板穿戴件。插銷結構可拆卸地設置於第一連接部，第二連接部具有保持一距離的第一與第二止擋塊以限制插銷結構的可活動範圍。第一樞轉機構具有第一可拆卸狀態。當第一樞轉機構位於第一可拆卸狀態時，嵌合結構位於缺口而得以從缺口脫離滑槽。
