To actualize a method which can measure electrostatic charging causing a hindrance to an electronic device, etc., in a wider space and further measure the induction electrostatic charging of a body moving in the space and the induction electrostatic charging of a peripheral body, caused by the electrostatically charged moving body.

An inductive receiving sensor 11, made of a square metal plate, detects unipolar electric charges induced by one or both of the movement of an electrostatically charged body and the potential variation of a stationary electrostatically charged body. A DC amplifier 13 amplifies the voltage induced on the inductive receiving sensor 11, which is received via a coaxial cable 12.