Provided is, for example, a power generation device 10 that performs efficient power generation even with weak input mechanical energy. A power generation device includes: a permanent magnet m having magnetic poles paired in a direction of a rotation axis r1; and a coil C formed by winding a conducting wire around at least one radial axis r2 directed outward from the rotation axis r1, in which a plurality of the permanent magnets m are arranged at predetermined intervals, radially with respect to the rotation axis r1, and along a circumferential direction.