The invention is about Foothold Power supply unit for Unicycle. Accordingly its origin and disassembly lines are simple, and the round bar that is equipped on waist has direction control. Front and Back drive/brake control works with sequential interchanging turning by powerful springs. During the quick braking, Power is generated as the body suddenly stops, and foothold gears, meshed with chain gears which are connected to each sides of the main wheel, put pressure on power supplying device.