To provide a vibration power generator for converting kinetic energy by vibrations accompanied by reciprocation to electric power, which is excellent in electric power conversion efficiency even when a housing is small-sized and is capable of increasing an output voltage by easily changing a resonance frequency of the vibration power generator.

For the vibration power generator, a magnet body includes two first poles respectively connected to both end faces of a magnet, each fixed body includes a buffer magnet for making reaction act with the magnet body and a second pole connected to the buffer magnet so as to get close to the magnet body on the side of the inner surface of a housing, and the first pole of the magnet body includes a peripheral part for stipulating the outer diameter of the first pole and a center projection part which is thicker than the peripheral part and gets closer to the second pole of the fixed body than the peripheral part.