BALANCE, MOVEMENT FOR WATCH, WATCH, AND METHOD FOR MANUFACTURING BALANCE

摘要

PROBLEM TO BE SOLVED: To provide a balance not required to perform the re-adjustment of a rate, and not reducing rotation balance and rotation performance, and capable of simply and highly accurately performing a temperature correction of an inertia moment, and a method for manufacturing the balance.SOLUTION: A balance 40 includes: a balance staff 41 rotatably pivoted; a balance wheel 42 whose one end is a fixed end fixed to a coupling arm 51 which is coupled to the balance staff 41 in a radial direction and the other end is a free end deformable in a radial direction. The balance wheel 42 includes: a first rim 54 located inside the radial direction and fixed to the coupling arm 51; and a second rim 55 arranged to overlap with an outer periphery of the first rim 54 and composed of a material different from that of the first rim 54 in coefficient of linear expansion. The first rim 54 and the second rim 55 are relatively restrained by a plurality of restraining parts spaced from each other.