A robot teaching pendant having improved operability achieved by being provided with a display function for a personal computer. The robot teaching pendant includes an emergency stop switch and a deadman switch necessary to secure the safety of an operator, and a jog key switch necessary for a teaching operation. The robot teaching pendant further includes a liquid crystal display unit for displaying an image signal supplied from a graphical (CRT) interface of the personal computer, whereby the robot teaching pendant not only serves as a display unit for the personal computer but also realizes an easy to operate display using the graphical user interface of the personal computer when a teaching operation and the like are carried out.