| 摘要 |
A lens barrel includes front and rear lens group frames, and a cam ring having a cam groove including a front-lens-group accommodation portion, a rear-lens-group-accommodation portion having a straight connecting portion connected to the front-lens-group accommodation portion, and an end portion. The front lens group frame is linearly guided and the rear lens group frame is relatively rotatably supportable and linearly guidably supportable. Rotation of the rear lens group frame is allowed when first and second followers are positioned in the front and rear-lens-group accommodation portions. When the cam ring is rotated from the accommodation portions, upon the rear lens group frame being switched from the relatively rotatable state to the linearly guidable state, the second follower rotates together with the cam ring while the second follower is positioned in the rear-lens-group accommodation portion or in the vicinity of the straight connecting portion.
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