toner image is formed on intermediate transfer belt 61 intermediate transfer belt 61 is formed as an endless belt using a film having the thickness of about 100 u03bcm to 150 u03bcm transfer of the toner image from photoreceptor drum 3 to intermediate transfer belt 61 is done by intermediate transfer roller 64 that is in contact with the back side of intermediate transfer belt 61 a high voltage transfer bias high voltage of a polarity opposite to the charged polarity u2212 of the toner is applied to intermediate transfer roller 64 in order to transfer the toner image intermediate transfer roller 64 has a metal shaft for example of stainless steel of 8 to 10 mm in diameter as a base with its surface covered by a conductive elastic member such as epdm or urethane foam because of this conductive elastic member uniform high voltage can be applied to intermediate transfer belt 61 though a roller shaped transfer electrode is used in the present embodiment a brush or the like may be used as an alternative the electrostatic images turned to visual images in accordance with the hue on respective photoreceptor drums 3 as described above are superposed on intermediate transfer belt 61 information of the thus superposed images density distribution of toner is transferred to a sheet of recording paper as intermediate transfer belt 61 is rotated by a transfer roller 10 arranged at the position of contact between the intermediate transfer belt 61 and the sheet of recording paper at this time intermediate transfer belt 61 and transfer roller.