PURPOSE: To constitute an operation panel so that a worker does not make careless errors in giving instructions and the like to each operating machine and provide the board which hardly causes the rise of a necessary cost and the increase of a maintenance burden.

CONSTITUTION: An operation panel is provided with hanging tools 3 capable of hanging a tablet board 10 having holes 11 bored only in positions of specified push button switches 2 so as to correspond to designated workpieces and the like in addition to a plurality of push button switches 2, which are operated selectively in accordance with workpieces, required specification and the like, and with a detecting means 4 which detects whether the tablet board 10 is hung on the hanging tools 3 and which stops the functions of the push button switches 2 when the proper hanging is not detected.