To prevent the air in a device main body from leaking to the outside together with ozone through the charger attaching and detaching aperture of a side plate.

While fetching the air in a device main body by an intake air fan 30, guiding the fetched air by an air intake duct 31 and guiding it to an electrification charger 11, the air of the circumference of the electrification charger is guided by an exhaust duct 33, and discharged out of the device main body through an ozone filter 34 by an exhaust fan 32. On the other hand, a charger attaching and detaching opening 21 is provided in a front side plate 20 equiped in the device main body, for positioning a photoreceptor 10, and an electrification charger 11 is equiped so that it can be pulled out through the attaching and detaching pouting. And the attaching and detaching opening 21 is sealed with an opening and closing cover 22 attached in the front side plate 20.