k lph 3 k developing device 4 k and cleaning section 8 k around photoconductive drum 1 k latent image forming sections are formed of electric charging section 2 y and lph 3 y electric charging section 2 m and lph 3 m electric charging section 2 c and lph 3 c and electric charging section 2 k and lph 3 k dual component developers including small particle toner and carriers for yellow magenta cyan and black are used in developing devices 4 y 4 m 4 c and 4 k respectively intermediate transfer body 6 is entrained about a plurality of rollers and rotates developing device 9 in the present embodiment serves as a heated roller fixing device which incorporates fixing roller 93 having a heating device and pressure applying roller 94 to press against fixing roller 93 developing device 9 nips recording sheet p carrying the toner image between fixing roller 93 and pressure applying roller 94 whereby the toner image is heated and pressed to be fixed on sheet p that is each color image formed by image forming sections 10 y 10 m 10 c and 10 k is sequentially transferred onto rotating intermediate transfer body 6 by transfer sections 7 y.