An optical apparatus having dust-off function comprises a dust-off filter located in the vicinity of an optical electronic device such as an image-pickup element, an image display element, or the like. An optical apparatus includes a mechanism that controls vibrating operation so that the frequency of vibration waves generated in the filter changes with the passage of time. An optical apparatus includes first vibrator for successive vibration with frequencies, a circuit monitoring the state of vibration of the optical element during vibrating operation of the first vibrator, thereby detecting the resonance frequency of the element, and second vibrator for vibration with the detected resonance frequency or a frequency approximate to it. An optical apparatus includes monitor for monitoring the state of vibration of the filter and a circuit for detecting abnormal states in accordance with output signals from the electrode.