Abstract: An operating device is provided with an operating section, in which a plurality of operating keys for operating a control target is laid out, and a display section, in which a screen corresponding to an input of the operating keys is to be displayed. The operating section does not have names of the operating keys printed thereon. The operating device or a controller has a storage means that stores guide information that guides the names of the operating keys. The names and an image of the operating keys corresponding to a selected language are displayed on the display section in accordance with a predetermined operation.