Light shielding unit and lens barrel equipped with the same

A light shielding unit, comprising:

• a first frame body having a substantially annular main body portion and a first opening that is provided at a center portion of the main body portion and configured to allow light to pass through in an optical axis direction;
• a second frame body having a substantially annular main body portion and a second opening that is provided at the center portion of the main body portion and configured to allow light to pass through in the optical axis direction;
• a plurality of movable blades that are disposed between the first frame body and the second frame body, that form a third opening through which passes the light that has passed through the first opening, configured to adjust an amount of light transmitted by varying a size of the third opening;
• a drive ring that is disposed between the first frame body and the second frame body, and configured to be rotationally driven when the plurality of movable blades are opened and closed, and having a substantially annular main body portion and a second protrusion that protrudes outward in a radial direction of a circle centered on the optical axis from an outer periphery of the main body portion;
• a drive source configured to rotationally drive the drive ring;
• and
• a light shielding member that is fixed to the second protrusion so as to protrude in the optical axis direction;
• a position sensing unit configured to detect the light shielding unit and sense a rotational position of the drive ring;
• and
• a rotation restricting unit that is provided to the second frame body and is configured to contact the second protrusion of the drive ring to restrict a rotational range of the drive ring.