A retractable lens barrel includes an annular ring having an axis parallel to and eccentric relative to an optical axis of the lens barrel; a holder accommodated within the annular ring and supporting a holder lens group; a first lens group aligned with the optical axis and movable towards the annular ring during accommodation of the first lens group within the annular ring; an actuator of an exposure control component, the actuator positioned inside the annular ring in a space between an inner peripheral surface of the annular ring and an outer edge of the first lens group accommodated in the annular ring.