A correction data generation method generates correction data used to correct the focal plane position of a lens in consideration of symmetry of PSF (point spread function) in an optical system. The binarization step binarizes the intensity of the PSF using a predetermined threshold value level. The minimum circle calculation step calculates a minimum circle that circumscribes the PSF binarized in the binarization step for each of a plurality of regions of an image. The PSF evaluation step evaluates the PSF of the entire image on the basis of the weighted average value of the radii of the minimum circles for the plurality of regions of the image, which are calculated in the minimum circle calculation step. The correction data calculation step calculates correction data used to correct the focal plane position of the lens on the basis of an evaluation value acquired in the PSF evaluation step.