A shutter/filter unit as an optical apparatus includes a shutter actuator, a filter actuator, a shutter drive ring, two shutter blades, and one ND filter, which are connected to a driving source body in series. The shutter blades are rotationally driven via the shutter drive ring so as to open and shut by the shutter actuator, and the ND filter is back and forth and rotationally driven by the filter actuator directly. The shutter blades and the ND filter are coaxially supported to a blade-support pin, and are rotationally driven independently. According to this apparatus, a conventional optical apparatus having a light-exclusion member and a light-attenuating member housed therein is further miniaturized so as to contribute miniaturization to an image-pickup apparatus, such as a camera, having the optical apparatus mounted thereon.