There is described an image forming apparatus, which makes it possible to form a lining cover sheet image at an appropriate position of the lining cover sheet, irrespective of change of the lining cover sheet width. The apparatus includes a lining cover-sheet width acquiring section to acquire a lining cover-sheet width; a cover-sheet image data acquiring section to acquire various cover-sheet image data sets; a cover-sheet image data arranging section to arrange the front cover-sheet image data and the rear cover-sheet image data in such a manner that they are arranged at an interval of the lining cover-sheet width, and to arrange the lining cover-sheet image data in such a manner that a lining image center line coincides with a cover sheet center line, in its width direction; and an image forming section to form the total cover sheet image, based on the arranged image data.