A wire harness producing method, which is configured to produce a wire harness by arranging a plurality of display devices end to end, each configured to include a display portion and a bezel portion arranged around a periphery of the display portion, displaying a wire laying out drawing in a full size in a length direction on the plurality of display devices, and laying out an electric wire along the wire laying out drawing, the method comprising: compartmentalizing a pre-created two-dimensional image of the entire wire harness into display regions to be displayed on the respective display portions of the plurality of display devices respectively and non-display regions corresponding to the respective bezel portions of the plurality of display devices respectively, with the display regions and the non-display regions conforming to sizes of the respective display portions and the respective bezel portions, respectively, of the plurality of display devices; trimming the two-dimensional image to create wire laying out image data composed of only the display regions for the wire laying out drawing; and displaying the wire laying out drawing on the plurality of display devices on the basis of the wire laying out image data having been created, wherein plate-shape transparent protecting covers are provided on the plurality of display devices, respectively, in such a manner as to cover uneven surfaces between the respective display portions and the respective bezel portions of the plurality of display devices to protect the respective display portions of the plurality of display devices, so that the electric wire is laid out on those transparent protecting covers, wherein the transparent protecting covers for the respective display portions of the plurality of display devices are each individually being provided for each of the plurality of display devices. compartmentalizing a pre-created two-dimensional image of the entire wire harness into display regions to be displayed on the respective display portions of the plurality of display devices respectively and non-display regions corresponding to the respective bezel portions of the plurality of display devices respectively, with the display regions and the non-display regions conforming to sizes of the respective display portions and the respective bezel portions, respectively, of the plurality of display devices; trimming the two-dimensional image to create wire laying out image data composed of only the display regions for the wire laying out drawing; and displaying the wire laying out drawing on the plurality of display devices on the basis of the wire laying out image data having been created, wherein plate-shape transparent protecting covers are provided on the plurality of display devices, respectively, in such a manner as to cover uneven surfaces between the respective display portions and the respective bezel portions of the plurality of display devices to protect the respective display portions of the plurality of display devices, so that the electric wire is laid out on those transparent protecting covers, wherein the transparent protecting covers for the respective display portions of the plurality of display devices are each individually being provided for each of the plurality of display devices.