Light-quantity control apparatus and optical apparatus

A light-quantity control apparatus comprising:

• a base member having a fixed aperture;
• and
• a light-quantity control blade having a light-quantity control portion to control a quantity of light passing through the fixed aperture and a supported portion rotatably supported with respect to the base member,
• wherein, when a direction orthogonal to an aperture plane of the fixed aperture is defined as an optical axis direction, and a direction extending along a diameter of the fixed aperture is defined as a radial direction,
• the light-quantity control portion and the supported portion of the light-quantity control blade are each rotated along a plane parallel to the aperture face, an intermediate portion thereof formed between the light-quantity control portion and the supported portion has a tilt with respect to the aperture plane toward the optical axis direction so that the light-quantity control portion is disposed distant from the supported portion in the optical axis direction, and thereby a concave space facing the fixed aperture is formed inside in the radial direction than the light-quantity control blade.