To provide a new permanent magnet element, which can be used for a generator or an accelerator sensor, a generator which is simple, small and reliable which can reduce its parts count by using this permanent magnet element, and can set the generated voltage to high, and to provide an acceleration sensor.

The permanent magnet element is constituted, being accommodated in an oscillating manner in the axial direction of a tubular body, in the nonmagnetic tubular body 2, where a coil 3 is wound around a peripheral face orthogonal to its axial direction, and it is obtained by combining a plurality of permanent magnets; the permanent magnet element 1 is constituted of a first permanent magnet body 5, where the respective homopoles of two permanent magnets are counterposed to each other, in the axial direction of the nonmagnetic tubular body and the axial centers are fixed with magnetic substances; and a second permanent magnet body 6 which is magnetically coupled with the axial outer face of the nonmagnetic tubular body of this first permanent magnet body.