To shorten a period of time necessary for performing routine inspections and reduce costs by monitoring a state such as a contact failure of a switching equipment which constitutes a power reception circuit or a branch circuit of a substation through a simple construction. A sensor attached IC tag application high voltage equipment is constructed by detachably mounting a sensor attached IC tag at a position where a sensor of a sensor attached IC tag obtains a physical quantity of a detection target, wherein the sensor attached IC tag is configured to communicate with an externally located IC tag reader.