Light shielding structure of a lens barrel

A light shielding structure of a lens barrel including an inner ring and an outer ring positioned outside said inner ring so that at least one of said inner ring and said outer ring rotates relative to the other, wherein said inner ring includes at least one through cutout portion which radially extends through said inner ring, said light shielding structure comprising:

• an inner flange wall provided with said inner ring to be positioned in front of said through cutout portion in an optical axis direction;
• a first annular groove formed on an inner surface of said inner flange wall, said first annular groove being centered about the optical axis;
• a second annular groove formed on an inner peripheral surface of said outer ring;
• and
• a light shield ring which includes a cylindrical portion centered about said optical axis, and an outer flange portion which extends radially outwards from a rear end of said cylindrical portion so that said cylindrical portion is inserted into said first annular groove to be slidably movable relative thereto, and so that said outer flange portion is inserted into said second annular groove to be slidably movable relative thereto.