Disclosed herewith is a prosthetic foot. The prosthetic foot is to be connected to a pylon that is utilized for the substitution of the shinbone of an amputee. The prosthetic foot includes an ankle portion to be secured to the pylon. A plurality of curved portions are extended from one end of the ankle portion. A sole portion is extended from one end of the curved portions. The ankle portion, the curved portions and the sole portion form a single integrated plate spring structure.