Abstract: A mirror apparatus includes a holder formed into a cup-shaped configuration and having an opening enclosed by a holding portion which is in the form of an inward projection. A mirror is disposed within the holder and has an outer surface exposed through the opening and a rear surface. A supporting member engages with the rear surface of the mirror in a surface-to-surface manner and permits transmission of ultrasonic vibrations. An elastic device urges the mirror on the holding portion via the supporting member independently from deformation of holder.