IMAGE FORMING APPARATUS

An image forming apparatus includes: a plural image forming units configured to form respective toner images in different colors; an endless-shaped intermediate transfer member that is rotatable in a peripheral direction of the intermediate transfer member and to which the toner images are to be sequentially transferred from the plural image forming units; a moment-of-inertia-increasing structure provided to one of rotatable image carriers that are included in the respective image forming units, the moment-of-inertia-increasing structure increasing a moment of inertia of the one image carrier relative to moments of inertia of other ones of the image carriers, the one image carrier being included in one of the image forming units that is located at a downstreammost position in a direction of rotation of the intermediate transfer member, the image carriers being in contact with the intermediate transfer member and configured to carry the respective toner images; a plural first-transfer units provided at positions across from the respective image carriers and configured to transfer the toner images carried by the image carriers to the intermediate transfer member; and a second-transfer unit provided on a downstream side relative to the plural first-transfer units in the direction of rotation of the intermediate transfer member and configured to transfer the toner images on the intermediate transfer member to a medium.