To provide a process planning device capable of promptly preparing a highly accurate plan without mistake even by the inexperienced staff, with a simple mechanism without any excess function and less initial investment.

This process planning device is provided with a first GUI screen 31 having controls 34 to 37 for inputting information and generates information to be required for a process plan of the present process by using the information inputted in the controls 34 to 37 for inputting information. The information to be required for the process plan of the present process is generated simply by inputting the information in the controls 34 to 37 for inputting information. The manual work is limited, a required process plan is prepared even by a staff with insufficient skills and the generation of a factitious mistake can be simultaneously avoided.