| 摘要 |
A lens barrel and a cam barrel are disclosed, in which a cam barrel is miniaturized and a molding ability is improved while maintaining the strength of the cam barrel. An outer peripheral side cam groove having a bottom part which does not penetrate a zooming cam barrel is formed in the outer peripheral part of the zooming cam barrel. An inner peripheral side cam groove having a bottom part which does not penetrate the zooming cam barrel is formed in the inner peripheral part of the zooming cam barrel. The outer and inner peripheral side cam grooves are arranged so as to be prevented from overlapping each other in the radial direction of the zooming cam barrel. The total depth of the outer and inner peripheral side cam grooves is set larger than the thickness t of the zooming cam barrel.
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