Automatic balancer

An automatic balancer comprising:

• a balance head configured to rotate integrally with a rotating body around a rotation axis of the rotating body, the balance head including a balance correction mechanism which is electric and configured to correct imbalance of the rotating body, and a case having a cylindrical outer peripheral surface parallel to the rotation axis and configured to house the balance correction mechanism;
• a stator provided separately from the balance head and having a shape which is along a circumferential direction of the outer peripheral surface with a clearance from the outer peripheral surface, the stator electrically connected to a controller of the balance head;
• and
• a rotor part provided at a position where the rotor part faces the stator on the outer peripheral surface and configured to rotate integrally with the balance head, the rotor part having a shape along the circumferential direction of the outer peripheral surface and electrically connected to the balance correction mechanism, wherein
• the stator and the rotor part are configured to perform wireless communication therebetween, and
• the stator and the rotor part face each other in an axial direction of the rotation axis,
• wherein the stator is formed in a ring shape along the circumferential direction of the outer peripheral surface, and is loosely fitted to the outer peripheral surface.