An abnormality detecting apparatus for an imaging apparatus that detects a presence of abnormalities in imaging apparatuses mounted on a vehicle to capture vehicle surroundings, which includes: a luminance variance value calculating device that calculates a luminance variance value of each image from the imaging apparatuses using the luminance value of each image from the imaging apparatuses obtained by the imaging apparatuses; and an abnormality detecting device that detects the presence of abnormalities in any of the imaging apparatuses in accordance with the luminance variance values calculated by the luminance variance value calculating device.