A foldable walker includes a front frame having left and right pin holes, two side frame units pivotably connected to the front frame, and two locking units. Each locking unit is disposed between the front frame and the respective side frame unit, and includes a lock releasing lever and a locking pin. The lock releasing lever has a pulling fulcrum portion, an operating portion opposite to the pulling fulcrum portion, and a pressing fulcrum portion disposed therebetween. An upwardly pulling action or a downwardly pressing action onto the operating portion permits rotation of the respective side frame unit between folded and unfolded positions. The locking pin is disposed between the pulling and pressing fulcrum portions to be inserted into the respective pin hole to lock the side frame units to the unfolded position, and is moved by the upwardly pulling action or the downwardly pressing action.一種助行器,包含一包括二銷孔之前支架、二分別樞接於該前支架之側支架單元,及二鎖卸單元。該等鎖卸單元分別包括一驅動手把,及一固定銷。該驅動手把具有一上扳支點部、一相反於該上扳支點部之驅動部,及一介於該上扳支點部及該驅動部之間的下壓支點部。上扳或下壓該驅動部使該驅動手把以該上扳支點部或該下壓支點部為旋轉軸旋轉。該固定銷突設於該上扳、下壓支點部之間,且可穿設於該銷孔。上扳或下壓該驅動部,能使該等側支架單元相對於該前支架旋轉,放鬆該驅動部,能使該等側支架單元固設於該前支架。1‧‧‧前支架11‧‧‧垂直管部12‧‧‧銷孔2‧‧‧側支架單元21‧‧‧側支架211‧‧‧樞轉管體22‧‧‧連接件221‧‧‧支承端222‧‧‧滑移穿槽223‧‧‧內周面224‧‧‧頂抵壁3‧‧‧鎖卸單元31‧‧‧驅動手把311‧‧‧上扳支點部312‧‧‧驅動部313‧‧‧下壓支點部314‧‧‧凹槽32‧‧‧固定銷321‧‧‧容置槽322‧‧‧頭部323‧‧‧容置空間33‧‧‧彈簧
