An imaging device unit completely removing dust attached to an optical device and an imaging apparatus. The imaging device includes: an imaging device including an imaging surface on which an optical image of a subject is formed and converting the optical image into an electric signal; a low pass filter (LPF) disposed between the imaging device and the subject; a plate mounted on a peripheral portion of the LPF and including arm units extending in a direction parallel to the plate; a piezoelectric device mounted on the plate and vibrating the plate and the LPF; and a support frame that surface-contacts with the arm units of the plate and supports the plate in the direction parallel to the one surface of the plate.