To provide an image forming device and a suction device constituted so that anyone can easily clean powdery dust, typically, toner accumulated in the image forming device.

As for the image forming device provided with an image forming unit using the toner, the image forming device is provided with a duct 11 leading from the upper part or the side part of a shielding plate 10 arranged under the image forming unit to an external outlet 11b formed in the outer surface of the device main body 1 so as to suck and carry the toner accumulated in the device main body 1 and equipped with a freely attachable/detachable dust filter 13 inside.