Aperture mechanism, optical apparatus and manufacturing method thereof

摘要

To provide an aperture mechanism (50) and an optical apparatus which are reduced in size. The aperture mechanism (50) comprising: a driving member (60) to be driven in accordance with an aperture operation; an aperture member (72) having an aperture to be driven by the driving member (60); a first engagement section (62) connected to one of the driving member (60) and the aperture member (72); a second engagement section (74) connected to another one of the driving member (60) and the aperture member (72) and engaged with the first engagement section (62); and a biasing member connected to at least one of the driving member (60.) and the aperture member (72) to provide a bias in a direction in which the first engagement section (62) and the second engagement section (74) are facing to each other.