Patent ID: 7693452

Claim:
A transfer belt unit, which is mounted in an image forming device by being inserted in a predetermined direction into a guide unit provided in the image forming device and extending to the predetermined direction, the transfer belt unit comprising: a first positioning member that positions the transfer belt unit with respect to the image forming device in a state where the transfer belt unit is inserted into the guide unit, the first positioning member being placed near the front of the transfer belt unit and before a handle as viewed from the direction of the insertion of the unit; a guiding member that holds the transfer belt unit with respect to the image forming device when the transfer belt unit is inserted almost horizontally into the guide unit by abutting on a guide surface, the guiding member together with the positioning member being placed before the handle as viewed from the direction of the insertion of the unit; the handle that allows a user to grasp the transfer belt unit when the transfer belt unit is inserted into the guide unit, the handle being placed on the side surface of the transfer belt unit being downstream of the first positioning member as viewed from the direction of inserting the transfer belt unit into the guide unit; and a second positioning member that is placed downstream of the handle as viewed from the direction of the insertion of the unit, wherein a plurality of the guiding members are arranged in the direction of inserting the transfer belt unit into the guide unit, and the guiding members positioned on the rear side in the direction of inserting the transfer belt unit in the guide unit among the plurality of guiding members have a smaller dimension in the up-and-down direction at the time of the insertion than the guiding members positioned on the front side.