An auxiliary elastic device for a joint protector is capable of producing auxiliary elasticity for human joints. The device includes a connecting body connected to a multiple of serially and pivotally coupled pivots, a through slot penetrated through the connecting body, and at least one stripe elastic rib movably installed in the through slot and capable of providing an elastic supporting force and an elastic restoring force when human joints are bent, so as to achieve the effect of reducing the burden of the joints.本發明係為一種應用在關節護具上的輔助彈性裝置，該裝置對應設置於人體關節的外部側邊，能夠在人體活動時對關節產生輔助彈性作用。該輔助彈性裝置包含一由複數個串連樞接之樞接件所組成之連結主體，所述連結主體內貫穿有一穿槽，該穿槽內活動設置至少一呈長條狀的彈力肋條，所述連結主體的兩端分別插入套接在二定位片上，藉由該定位片能將連結主體固定在關節護具上。使用時，連結主體以及彈力肋條能隨著關節活動方向彎曲，且其中的彈力肋條能夠在人體關節彎曲時提供彈性支撐力與彈性恢復力，同時達到關節護具輕量化以及減輕關節負擔之目的。
