The lens barrel includes a main aperture stop, a first sub aperture stop including a first stop blade and a first driving member rotatable about an optical axis to drive the first stop blade in its open and close direction, a second sub aperture stop including a second stop blade and a second driving member rotatable about the optical axis to drive the second stop blade in its open and close direction, and a cam barrel including a first cam portion engaging with a first engagement portion provided to the first driving member and a second cam portion engaging with a second engagement portion provided to the second driving member. The cam barrel is rotatable about the optical axis to rotate the first and second driving members.