An image pickup optical system includes an aperture stop, a first apodization filter disposed on an object side of the aperture stop, and a second apodization filter disposed on an image plane side of the aperture stop, each of the first apodization filter and the second apodization filter satisfies a predetermined condition, and a meridional light beam of a maximum angle of view has an optical path not involving at least one of a point of intersection between the optical axis and the first apodization filter and a point of intersection between the optical axis and the second apodization filter when an aperture size of the aperture stop is maximum.