Image forming apparatus

An image forming apparatus, comprising:

• an image carrier that includes a conductive substrate, an intermediate layer stacked on a surface of the conductive substrate, and a photosensitive layer stacked on a surface of the intermediate layer;
• a charging roller that receives, while being in contact with a surface of the image carrier, application of a prescribed DC voltage and thus charges the surface of the image carrier;
• an exposure device that exposes to light the surface of the image carrier charged by the charging roller so as to form an electrostatic latent image having attenuated charge thereon;
• and
• a developing device that supplies toner to the image carrier so as to develop the electrostatic latent image into a toner image,
• wherein
• the photosensitive layer includes an electric charge generation layer and an electric charge transport layer stacked on a surface of the electric charge generation layer, and the electric charge transport layer contains an antioxidant expressed by a general formula (1) below, and
• the charging roller has a resistance value in a range of 2×105 to 2×106[Ω] when a DC voltage of 500 V is applied thereto under an environment of 10° C. and 10% RH:
• where in the formula (1), R1 represents an alkyl group having 1 to 10 carbon atoms or a general formula (2) below in which R2 represents an alkyl group having 1 to 10 carbon atoms: