Transfer device and image forming apparatus including the same

A transfer device, comprising:

• an intermediate transfer belt provided to extend in an arranged direction of a plurality of photosensitive drums;
• and
• primary transfer rollers each transferring a toner image formed on a corresponding one of the plurality of photosensitive drums to the intermediate transfer belt,
• each of the primary transfer rollers being moved between a position causing the intermediate transfer belt to be in contact with the photosensitive drums and a position causing the intermediate transfer belt to be separated from the photosensitive drums,
• a center distance between a center axis of each of the photosensitive drums and a center axis of a corresponding one of the primary transfer rollers at the position causing the intermediate transfer belt to be in contact with the photosensitive drum being set to be larger than a sum of radiuses of the photosensitive drum and the primary transfer roller, the transfer device, and each of the primary transfer rollers being rotatably supported by a movable member,
• wherein the movable member includes an abutting portion which regulates a position of the primary transfer roller,
• wherein the abutting portion abuts on an abutted member whose positional relationship with the photosensitive drum is defined such that the position of the abutted member causes the intermediate transfer belt to be in contact with the photosensitive drum, and
• wherein the abutted member includes an abutted surface on which the abutting portion is abutted and which is configured to regulate at least one of positional deviations of the primary transfer rollers, the one positional deviation being a positional deviation in a direction perpendicular to a direction where the intermediate transfer belt is suspended.