A lens barrel includes a first tube and second tube, the first tube movable relative to the second tube by rotation of the second tube, an engaging unit disposed on the second tube, and a barrier driving unit disposed on an object side of the first tube that opens and close a barrier. The first tube is relatively moved in an optical axis direction by engaging with the engaging unit. The barrier is opened and closed when a first interlocking unit which is arranged on the barrier driving unit and a second interlocking unit which is arranged on the cam tube are shifted from a non-interlocking state to an interlocking state. When the first interlocking unit and second interlocking unit are in the interlocking state, at least a portion of the first interlocking unit and the engaging unit overlap with each other in a radial direction of the second tube.