Image forming apparatus

An image forming apparatus comprising:

• an apparatus body having an image forming unit including an intermediate transfer belt and configured to form a toner image and to cause the intermediate transfer belt to bear the formed toner image;
• a transfer unit including a transfer member configured to secondarily transfer the toner image from the intermediate transfer belt to a sheet, wherein the transfer unit is configured to be rotatable about a first rotation shaft with respect to the apparatus body;
• a fixing unit configured to fix the toner image secondarily transferred to the sheet as an image on the sheet;
• and
• a duplex conveyance unit configured to convey the sheet having passed through the fixing unit toward the image forming unit again,
• wherein the transfer unit includes:
• a reading unit configured to read the image fixed on the sheet conveyed along a conveyance path in the duplex conveyance unit,
• a first signal transmission member that has a flat shape and that is connected to the reading unit,
• a relay member connected to the first signal transmission member and configured to relay a signal from the first signal transmission member, and
• a second signal transmission member having a round shape, wherein the second signal transmission member is connected to the relay member, and
• wherein the second signal transmission member leads into the apparatus body from an inner portion of the transfer unit in an axial direction of the first rotation shaft.