A light shielding device of a lens includes a movable barrel; an outer member positioned around the movable barrel; and a light shield ring for preventing ambient light entering the lens through a clearance between the movable barrel and the outer member, the light shield ring having a center opening through which the movable barrel is movably fitted and a self-centering annular portion around the center opening. The self-centering annular portion is in contact with an outer surface of the movable barrel and is bent by, and along, the outer cylindrical surface of the movable barrel. The light shield ring is biased against an annular part of the outer member by a biasing member, so that the light shielding ring is movable in a radial direction when a radial force is applied to the light shielding ring via the movable barrel and the self-centering annular portion.