Heating device and image forming apparatus

An image forming apparatus comprising:

• a first rotating member whose circumferential surface revolves to move;
• a second rotating member whose circumferential surface revolves to move in contact with the circumferential surface of the first rotating member, the second rotating member being arranged next to the first rotating member, holding in corporation with the first rotating member an object which is held between the second rotating member and the first rotating member, and heating the object while causing the object to pass according to a revolution movement of the circumferential surface;
• a pair of supporting plates arranged on both sides across the first rotating member and the second rotating member in a width direction crossing a passing direction of the object, the pair of supporting plates supporting the first rotating member and the second rotating member from both the sides, and each of the pair of supporting plates whose a first surface faces the first rotating member and the second rotating member;
• a resistance element arranged on a second surface side opposite to the first surface of the supporting plate with respect to either one of the pair of supporting plates, the resistance element representing a type of a heating device by using resistance;
• and
• an identifying unit that acquires an electric signal, which has passed through the resistance element, to identify a type of the heating device.