A deadman switch mechanism and a teaching operation panel equipped with the deadman switch mechanism, in which possibility of losing a safety function is low even if failure happens in a contact or other elements of a circuit. When an operator grips at least one of grip levers (GL1; GL2) with normal force, the grip levers turn around axes (AX4; AX5), shoulder portions (SD1; SD2) abut on slave levers (SL1; SL2) and turns the slave levers connected by a link (LK) around an axis (AX3) in the direction denoted by an arrow B, simultaneously, so that switches (SW1; SW2) are turned into an ON-state, simultaneously. Then, two circuits including those switches, respectively, output ON-signals independently and these signals are subjected to AND process, to allow the robot to operate. In an emergency, when an operator releases gripping of the grip levers (GL1; GL2), the slave levers (SL1; SL2) turn in the direction denoted by an arrow A, simultaneously, so that the switches (SW1; SW2) are brought into an OFF-state, simultaneously, and the robot stops immediately.