PURPOSE: An energy storing prosthetic foot keel is provided which makes manner of walking of a handicapped natural, reduces energy consumed during walking of the handicapped, and facilitates wearing thereof by structurally simplifying the prosthetic foot keel. CONSTITUTION: In a prosthetic foot keel connected to a pylon which is used as a substitute for shinbone of below-knee amputees, the prosthetic foot keel comprises an ankle part(105) coupled to the pylon; a bottom part(111) which is positioned as the sole; a plurality of curved surface parts which are positioned between the ankle part and the bottom part so as to connect the ankle part with the bottom part, wherein the ankle part, bottom part and plurality of curved surface parts form an integral type plate spring structure, wherein the plurality of curved surface parts comprise a first curved surface part(106) which is connected to the ankle part and formed in a radius of curvature of R1 and a second curved surface part(109) which connects the first curved surface part with the bottom part and is formed in a radius of curvature of R2, wherein a flat part(108) having a length of L1 is connected between the first curved surface part and the second curved surface part, and the bottom part has a length of L2 and inclined in a certain angle of , wherein a toe part(113) is formed at the end part of the bottom part in a radius of curvature of R3, wherein an aluminum pad(120) is adhered to the area contacted with the pylon in the ankle part, and wherein the prosthetic foot keel is a fiber reinforced composite material.
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