both sides of the group of color recording heads 14 further in the present embodiment in order to display the image gradation by a plurality of ink droplets for a single pixel the driving frequency of the nozzle is set to be relatively high so that a plurality of the ink droplets are jetted during a single scanning however it is also possible to use a manner in which a single droplet is jetted during the first ink scanning and one more droplet is jetted onto the same place during a second scanning and thereby a plurality of the ink droplets can be jetted for a single pixel still further by arranging the nozzles in two lines on the recording head a plurality of the ink droplets can be jetted for a single pixel additionally in this embodiment gradation is obtained by jetting a plurality of ink droplets for a single pixel but it is also possible to control the recording head to jet a single droplet for a single pixel still further in the present embodiment used is a photo curable ink which is hardened by the radiation of ultraviolet rays but ink is not limited to this type and ink which is hardened by the radiation of light rays other than ultraviolet rays can also be used u201c light rays.