The invention provides a wire harness manufacturing apparatus which includes a plurality of displays arranged along the length direction of harness as a manufacturing target, and which divides a wiring image and displays the image on a rectangular display portion of each display. The wiring image displays a wiring state of wires forming the harness with two ends of each wire being pulled to show the whole length, and a wire conveying robot walking along a long edge direction of the display portion and conveying the wires. The display portion is supported so that the display surface is almost level and operation can be performed on the display surface. One long edge side of the display portion is a walking zone of the wire conveying robot, and the other long edge side is an operation zone of an operator.