An image forming apparatus forms an electrostatic latent image
corresponding to an image information signal on an image carrying member,
develops the electrostatic latent image using a two component developer of
toner particles and carrier particles and transfers the unfixed image to a
transfer medium. A fixer is provided with at least a fixing roller and a
press roller which nips and delivers the transfer medium to fix the
unfixed image. The carrier particles contain a binder resin and magnetic
metal oxide and have shape factors SF-1 of 100 to 150 and SF-2 of 100 to
150. The fixing roller has an elastic layer and a release layer of a
fluorine resin having an Asker-C hardness between 60.degree. and
85.degree. at the time of application of a 1 kg load.
