The invention provides a power generator which can rapidly rotate a magnet without using a flicking mechanism and an electronic device including the power generator. A power generator 1 includes an operating portion 51; a first rotating member 62 rotated by external force applied through the operating portion 51, a second rotating member 63 which can be rotated in the same direction as the first rotating member 62, an elastic member 65 coupled with the first rotating member 62 and the second rotating member 63 so as to store elastic energy when the first rotating member 62 is rotated and release the stored elastic energy to rotate the second rotating member 63, a magnet assembly 66 engaged with the second rotating member 63 and rotated together with the second rotating member 63, and a coil assembly 67 including a coil 672 and a coil core 673 inserted into the coil 672 and arranged so that magnetic torque is generated between the magnet assembly 66 and the coil core 673.