OFFLINE PROGRAMMING DEVICE AND OFFLINE PROGRAMMING METHOD

[Problem to be solved] Notify an error to a user between teaching points. [Solution] An offline programming device includes an input circuitry that receives input of a plurality of teaching points, a creation circuitry that determines intermediate point located between adjacent teaching points and creates an operation program for the robot, a simulator that simulates a movement trajectory of the robot when the operation program is executed, and a display that displays a GUI screen representing the movement trajectory. The GUI screen includes a first display area showing a time series sequence of the plurality of teaching points and a second display area showing a time series sequence of a plurality of the intermediate points between the plurality of teaching points on a larger scale than the first display area. When an error is detected in the movement trajectory, a section between the teaching points including the point in time when the error occurs is displayed in the first display area according to a first error display method, and the intermediate point corresponding to the point in time when the error occurs is displayed in the second display area, according to the second display method.