PURPOSE: To output the energy of a permanent magnet as kinetic energy by converting thrusts such as attraction and repulsion acting between opposed magnets into those in the kinetic direction.

CONSTITUTION: A magnet prime mover has a stationary side 1 and a rotary side 2, a reciprocating pole 3 of an N-pole is provided at the stationary side 1, and reciprocated by a spring 9, a discharge cylinder 12 and an output cylinder 13. A rotary side S-pole 4 and a rotary side N-pole 7 are provided at the rotary side 2, and a ratchet gear 6 is formed. A rack pawl 5 to be engaged with the gear 6 is formed, and a ratchet shaft 8 is driven by the cylinder 13. Thus, the piston shaft of the cylinder 12 coupled to a vertical shaft pressurizes inner liquid to press the gear 6 through the piston of the cylinder 13 and the pawl 5 thereby to move the rotary side 1 in its kinetic direction 10, thereby providing rotary motion by permanent magnets 3, 4, 5.