To protect a mounted electronic component from a rectangular pulse-shaped high voltage to be applied to a circuit board to be inspected as an inspection signal.

A circuit board inspection device includes a voltage generation source PS. An output control part of the voltage generation source PS reduces a cut-off frequency fc of a high frequency component included in the rising edge of a rectangular pulse-shaped inspection voltage V1 output from the voltage generation source PS to less than a cut-off frequency fth of an integral waveform V2 by stray capacitance C1 existing between a grounding probe and ground potential, stray capacitance C2 existing between the ground pattern of a circuit board to be inspected and ground potential, and impedance Z of an electronic component.