MAGNET BEARING STRUCTURE, MOVEMENT, AND WATCH

摘要

PROBLEM TO BE SOLVED: To provide a magnet bearing structure capable of suppressing variation of the rotation period of a bearing member.SOLUTION: A magnet bearing structure includes: a balance staff 22 having tenons 21A, 21B in both end parts and rotated around a shaft; shaft member side magnets 31A, 31B disposed in the balance staff 22 and generating a magnetic force in the tenons 21A, 21B; bearing units 40A, 40B having a bearing part 41 rotatably supporting the balance staff 22; bearing side magnets 51A, 51B disposed in the bearing units 40A, 40B and generating, in a bearing part 41, a magnet force repelling the magnet force generated in the tenons 21A, 21B; a projection part 25 disposed on the tenons 21A, 21B and projected along an axial direction of the balance shaft 22; and a recess portion 45 disposed in the bearing part 41 and covering the projection part 25 from an axial direction and a radial direction.