To provide an insulation inspecting apparatus for correctly determining the existence of a discharge occurring with a supply of inspection voltage.

The insulation inspecting apparatus includes: a voltage supplying section 4 for outputting the inspection voltage Ve; a detecting section 2 for detecting physical quantities generated by supplying the inspection voltage Ve to conductor patterns 102a-102c on a circuit board 100; and a control section 10 for implementing the determination processing for determining the existence of the discharge in the conductor patterns 102a-102c based on the physical quantities detected by the detecting section 2, and is configured so as to inspect an insulating state of the circuit board 100. The detecting section 2 detects two or more physical quantities other than a combination of two physical quantities as a voltage value Vm and a current value Im only among the voltage value Vm, the current value Im, a light intensity Lm and a sound volume Nm. The control section 10 implements the determination processing based on two or more physical quantities detected by the detecting section 2.

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