PROBLEM TO BE SOLVED: To provide a lower extremity orthosis having a simple configuration, being lightweight, and facilitating wearing.SOLUTION: A lower extremity orthosis (100) includes: a leg-worn part (10) to be mounted on an ankle of a wearer a foot-worn part (20) to be connected to a heel side of the leg of the wearer so as to move, along with the foot of the wearer, with respect to the leg-worn part (10) a C-shaped spring (30) for connecting the leg-worn part (10) to the foot-worn part (20) and, depending on a situation, a buffer member (40) for preventing contact between the leg-worn part (10) and the foot-worn part (20).SELECTED DRAWING: Figure 1
