A lens barrel is a lens barrel that can be mounted to a camera body, including a lens element, a lens support frame, an actuator, and an electrical contact. The lens support frame supports the lens element. The actuator is arranged to drive the lens support frame in an optical direction of the lens element, and includes a drive shaft and a detector configured to detect rotation of the drive shaft. The electrical contact is disposed on the opposite side from the actuator with respect to the lens element when viewed in the optical axis direction parallel to the optical axis of the lens element, and is configured to be electrically connected with the camera body.