To avoid hazardous conditions caused by high-voltage output.

The electronic device comprises a high-voltage output section 2 for outputting a high-voltage test voltage V0, a display section 6 for displaying the output condition of the test voltage V0 by the high-voltage output section 2, a fault detection section 7 for detecting the fault condition of the display section 6 and outputting a fault detection signal Sk, an a control section 9 for stopping the output of the test voltage V0 to the high-voltage output section 2, when the fault detection signal Sk is output. The display section 6 is provided with LEDs. The fault detection section 7 detects, at least either the break condition or the short-circuiting conditions of the LEDs and outputs the fault detection signal Sk.