Lens barrel and camera device

A lens barrel comprising:

• a cylindrical fixed frame;
• an annular operation ring disposed outside the fixed frame coaxially with the fixed frame and rotatable with respect to the fixed frame;
• a drive frame disposed inside the fixed frame coaxially with the fixed frame and rotatable together with the operation ring with respect to the fixed frame;
• a mobile frame movable together with a lens held by the mobile frame along an optical axis direction, based on a rotation of the drive frame;
• a coil array fixed to any one of the fixed frame and the drive frame and composed of a plurality of coils disposed alongside in a circumferential direction;
• and
• a magnet array fixed to the other of the fixed frame and the drive frame and composed of a plurality of magnets disposed alongside in the circumferential direction,
• wherein the drive frame is rotated with respect to the fixed frame by electromagnetic force generated by supplying a current to the coil array, and the mobile frame is driven along the optical axis direction.