To ensure patient's safety by turning off a control power source in the case of unusual operation.

At the body operating device that has a body operating device, a controller 100, watch dog timer circuit 2a in the controller 100, two gate circuit 6 and 7, comparative circuit 8 that compares outputs of two gate circuit 6 and 7, and logical circuit 9 that performs logical calculation of the output of the comparative circuit 8, pulse is outputted from PIO board of the controller 100 to the watch dog timer circuit 2a within fixed time, a watch dog timer circuit 2b makes the control power off when the pulse is not inputted to the watch dog timer circuit 2b within the fixed time, an alarm condition of the controller 100 is monitored, outputs of control power on confirmation signal for the logical circuit and brake releasing confirmation signal are inputted to the PIO board 2b, and the control power is turned off when at least one side of the signal is unusual.