IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of suppressing an amount of ultrafine particles retaining around a fixing device.SOLUTION: An image forming apparatus of the invention comprises: a fix particle detection part 51 detecting the number of ultrafine particles included in air present around a fixing part; a control part 55 causing the fixing part to conduct a normal mode or an ultrafine particle coping mode in accordance with a detection result obtained by the fix particle detection part; fans 42 and 43; filters 47 and 48; and a moving part 45 moving a duct 41. The control part 55 obtains a determination value on the basis of the number of ultrafine particles detected by the fix particle detection part 51, so as to cause the fixing part to conduct the normal mode when the determination value is a prescribed threshold value or smaller and to conduct the ultrafine particle coping mode when the determination value exceeds the prescribed threshold value. The duct 41 is connected to the first filter 47 in conducting the normal mode and is connected to the second filter 48 with finer mesh in conducting the ultrafine particle coping mode.