A lens barrel includes: a lens frame that holds a lens and is movable in the optical axial direction of the lens; and a moving mechanism that moves the lens frame in the optical axial direction. The moving mechanism includes: a feed screw; a drive source that rotates the feed screw; a biasing member that biases the lens frame toward direction side; a nut on the direction side of the lens frame that is screwed with the feed screw; and a low-friction member between the nut and the lens frame in the optical axial direction. At least one of a friction coefficient between the lens frame and the low-friction member or a friction coefficient between the nut and the low-friction member is smaller than a friction coefficient between the lens frame and the nut when the lens frame is in contact with the nut.