A lens barrel includes: a plurality of lenses disposed in an outer enclosure; an imaging device that converts image light introduced through the plurality of lenses into an image signal; a movable unit including a movable lens and a lens holder that holds the movable lens; a lead screw rotated by a drive motor; a nut member made of a metal material threadably engaging the lead screw and connected to the lens holder, the nut member moved by the rotation of the lead screw in the optical axis direction moving the movable unit in the optical axis direction; a guide shaft that guides the movable unit in the optical axis direction, both axial ends of the guide shaft held by the outer enclosure; and an urging spring that presses part of the lens holder against the nut member when the movable unit moves in the optical axis direction.