Image forming apparatus capable of copying images on various copy items

An image forming apparatus comprising:

• toner image forming means for forming a toner image corresponding to an image of an original document at a set operative copying magnification;
• transfer means for transferring the toner image onto a copy item;
• fixing means for fixing the toner image on the copy item under heat;
• storage means for storing correction values for a plurality of types of copy item usable in the image forming apparatus respectively, the correction values being adapted for correcting a change in length of a copy item due to the heat of the fixing means;
• judge means for judging what type a present copy item is of;
• and
• magnification setting means for setting an operative copying magnification for the toner image forming means, the magnification setting means including:
• nominal copying magnification setting means for setting a nominal copying magnification;
• correcting means for reading a correction value corresponding to the judged copy item type from the storage means and correcting the set nominal copying magnification into the operative copying magnification.