1. A method for manufacturing a color image pickup device including a pixel group in which a plurality of pixels each having a photoelectric conversion element and a color filter are arranged, the method comprising the steps of: generating a random array pattern in which color filters of at least one color component are randomly arranged for an arbitrary pixel position, so that the occurrence frequency of color filters of a color component in a region having a predetermined size including the arbitrary pixel position is within a desired error range; generating a regular array pattern in which color filters of at least one color component are regularly arranged, the color component being different from the color component of the filters randomly arranged in the random array generating step; and generating a color filter pattern by compositing in a regular manner the random array pattern generated in the random array generating step and the regular array pattern generated in the regular array generating step.