| 摘要 |
A light amount adjusting device (1) is provided with a base plate (80) having an opening (81), linearly movable blades (30, 50) linearly movably supported by the base plate (80), and a rockable blade (60) rockably supported by the base plate (80). The linearly movable blades (30, 50) and the rockable blade (60) form a fully open state by retracting from the opening (81), and the linearly movable blades (30, 50) form a fully closed state by covering the opening (81). The rockable blade (60) has an aperture opening (61) having a smaller diameter than the opening (81). When the opening (81) and the aperture opening (61) are superposed on each other, a small aperture state is formed.
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