To provide a copying machine having a function to efficiently decompose ozone and nitrogen oxides generated from the electrophotographic photoreceptor and harmful chemical substances such as formaldehyde, styrene or the like produced from the fixing device and having a humidity controlling function to control the humidity in the copying machine room.

A small-size air purifying machine is mounted on the back face of the photoreceptor or fixing device chamber of the copying machine and tiles made of diatomaceous are attached to the front, side or back face of the copying machine. In the air cleaner, a nonwoven fabric deodorizing sheet containing titanium oxide and activated carbon or a photocatalyst filter Aqua Radit(R) which can be washed with water to regenerate, manufactured by Mitsubishi Paper Mills Limited, is used for a deodorizing filter. Further, aluminum honeycomb containing zeolite carrying titanium oxides and vanadium oxides, composite material of manganese and copper and hydrated silver oxide is used for a deodorizing filter with additives.