PURPOSE: To provide an image forming device which, even in high temperature and high humidity environments, forms a stable image rapidly after a power source is turned on and forms a stable image irrespective of a surrounding environment.

CONSTITUTION: A photosensitive drum 3 is electrified by the contact of the contact-electrifying member 26 of an electrifying means 2 with the surface of a photosensitive drum 3, an electrostatic latent image is formed by subjecting the photosensitive drum 3 to exposure by an exposure means 5, a visible image is formed by supplying toner 15 to the electrostatic latent image on the photosensitive drum 3 by the use of a developing means 6, the toner 15 on the photosensitive drum 3 is transferred to a form by a transfer means 7, the toner 15 transferred to the form is heated and fused by a fixing roller 4, so that the toner 15 is fixed on the surface of the form. At that time, heat is conducted by a metal plate 1, made of an excellent heat-conductive material, from the fixing roller 4 to the electrifying means 2.