PURPOSE: To suppress the damage due to inductive disturbance to the min. degree by informing the generation of the inductive disturbance due to lightning and to reinforce the maintenance system of OA machinery such as a facsimile.

CONSTITUTION: An inductive disturbance monitor system is equipped with inductive disturbance preventing elements 1a, 1b preventing the inductive disturbance due to lightning to a line, a preventing operation detection part SEN detecting the preventing operation of inductive disturbance due to the inductive disturbance preventing elements 1a, 1b, inductive disturbance detectors 4a, 4b detecting the inductive disturbance due to lightning and an inductive disturbance information device 5 displaying, printing or transmitting the inductive disturbance data showing the generation of inductive disturbance on the basis of the generation and detection operation of the inductive disturbance from the inductive disturbance detectors 4a, 4b.