An imaging device includes illuminating means configured to illuminate a measurement object with light from a light source aberration correcting means (105, 205, 905) configured to correct aberration of the measurement object occurring in light returning from the measurement object, the returning light being provided by light illuminating the measurement object through an area differing from a center axis of the illuminating means and image obtaining means configured to obtain an image of the measurement object on the basis of light returning from the measurement object, the returning light being provided by light that is provided after the aberration is corrected by the aberration correcting means and that illuminates the measurement object through the center axis of the illuminating means.
