IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To enable reduction of device size and reduction of cost and to suppress generation of an abnormal image due to a variation of speed of an intermediate transfer body.SOLUTION: An image forming apparatus 100 comprises: image carriers 1 (Y, M, C, K); an intermediate transfer body 2 which is stretched over a plurality of stretch rollers and is disposed in contact with the image carriers; first transfer members 3 (Y, M, C, K) which are disposed in contact with the image carriers via the intermediate transfer body; and a second transfer member 5 which is disposed facing a stretch roller via the intermediate transfer roller. It also comprises a transfer device 50 which transfers a toner image developed on the image carriers to the intermediate transfer body by forming a first transfer electric field between the image carriers and the first transfer members and then transfers it to a recording medium by forming a second transfer electric field between the intermediate transfer body and the second transfer member via the recording medium 6. In the image forming apparatus, control means 200 performs control in such a manner that intensity of the first transfer electric field is switched depending on a contacting state between the recording medium and the intermediate transfer body.