TEMPERATURE-COMPENSATED BALANCE, TIMEPIECE MOVEMENT, AND MECHANICAL TIMEPIECE

PROBLEM TO BE SOLVED: To provide a temperature-compensated balance which is capably of ensuring an amount of temperature compensation of a required inertial moment while ensuring strength, and a timepiece movement and a mechanical timepiece including the same.SOLUTION: A temperature-compensated balance includes: a balance staff turning around an axis; and a balance wheel which has a plurality of bimetal parts 50 arcuately extending along a circumferential direction of the axis of turning and connection members connecting respective bimetal parts 50 and the balance staff in a radial direction. Each bimetal part 50 is a laminate where a first member 60 and a second member 61 different by thermal expansion coefficients are laminated in the radial direction, and one end part in the circumferential direction of the bimetal part 50 is a fixed end 50A connected to the connection member, and the other end in the circumferential direction is a free end 50B. Each bimetal part 50 has a thickness gradually reduced from the side of the fixed end 50A toward the free end 50B along the radial direction.