IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To provide an image forming device capable of accurately setting the position of a transfer member for transferring a toner image formed on an image carrier to an intermediate transfer body with simple constitution, improving positional accuracy between the image carrier and the transfer member and preventing an image defect from being caused by lowering of the positional accuracy between the image carrier and the transfer member as for an image forming device using an intermediate transfer body. SOLUTION: This image forming device is equipped with a supporting member to support the transfer member to freely move in a direction where it contacts with/separates from the image carrier and a paper carrying direction crossing with the said direction, a transfer member side holding member to rotatably hold the transfer member, an image carrier side holding member to rotatably hold the image carrier and positioning members respectively provided in the transfer member side holding member and the image carrier side holding member and engaged with each other so as to position the transfer member with reference to the image carrier.