Abstract: This invention relates to a spiral spring power source for a toy, which can select a method of winding a power spiral spring 7 by a pulling string type winding cord 25 and a method of winding the power spiral spring 7 by a winding key 43 by removing a mechanism relative to the winding yarn 25, can alter the pulling direction of the winding cord 25 at 360.degree. in case of the method with the winding cord 25, can drive the output shaft through a gear set when uncoiling the energized power spiral spring 7, but can produce outputs not at one position but at a plurality of positions to be connected to a plurality of gears selected from the gear set.