Provided is a steering-wheel power generation device that, when operating in-vehicle equipment wirelessly from an operation unit provided on a steering wheel, can supply power having high power generation efficiency and space efficiency in line with practical use.A ring-shaped rack and a gear power generator fitted to the rack are provided in the gripping portion of the steering wheel, and a guide groove portion is provided on an inner wall of the gripping portion, thereby enabling a guide portion to absorb shock other than the shock in the power generation direction, and enabling stable power supply even when the steering wheel is being rotated.