To provide a means for solving the problem of increase of the time needed for recording due to increase of the number of main scanning necessary for recording an image so as to have image irregularity, stripes, or the like hardly visible in the case of recording an image with a recording head 5 having a plurality of ink ejection nozzles, mounted on a carriage 4, by repeating the operation of moving the same in the main scanning direction with respect to a medium to be recorded M, and sub scanning of moving the medium to be recorded M in the direction perpendicular thereto in an image recording device such as an ink-jet printer.

The main scanning moving speed is increased according to increase of the n value at the time of recording an image by controlling the sub scanning moving amount such that S is superimposed by n times with the premise that the image area recordable by one main scanning by a plurality of recording elements is S, and n is a positive integer including 0.