A teaching device (40) for creating a program using icons representing functions that form a control program for an industrial machine, the teaching device (40) being provided with: a screen display generation unit (155) that generates a program creation screen which has a predetermined region for arranging multiple icons to create a control program; and a relationship display generation unit (154) that, on the basis of information related to multiple icons, extracts two or more icons which are related to each other in terms of processing contents from among the multiple icons arranged on the predetermined region, and displays the relationships between the extracted two or more icons so as to be visibly recognized.