To continue applying rotation to a main shaft using the force of magnets assembled inside, without requiring supplying of energy from the outside.

The magnetic rotation maintaining device is so configured that, when the main shaft rotates, magnets mounted on a rotor of the body and magnets mounted on a disc of the main shaft come closer to each other and go away from one another, repeatedly on the orbit within a range of rotation. The magnets facing each other have magnetic poles of the same polarity. According to this constitution, when the magnets come closer to each other, they repel one another and thereby the disc is energized and gains a rotating force, causing the main shaft to rotate. By repeating this cycle, the main shaft can be kept rotating.