An image restoration apparatus reduces blur developed in an image generated by synthesizing a plurality of input images that are sequentially captured to stably prevent the development of ringing artifacts while reducing an increase in processing load. The apparatus includes: a PSF obtaining unit obtaining a first Point Spread Function (PSF) showing blurs which develop across input images; a PSF transforming unit processing the first PSF to generate a second PSF, so that, in a frequency domain, an amplitude value for each of frequencies is not smaller than a threshold value; an image converting unit converting the input images into multiple converted images based on portions of the second PSF and each corresponding to one of the input images; and an image restoring unit restoring a degraded image, into which the converted images are synthesized, to generate a restored image, the restoration being executed based on the second PSF.