SWITCHING EQUIPMENT DIAGNOSTIC DEVICE

A diagnostic apparatus (10) for switching device diagnoses whether any anomalies occurs in a switching device including an operation shaft (26) that opens and closes a circuit breaker contact (30) serving as a contact. The diagnostic apparatus for switching device includes: a gradient calculation unit (12) that calculates a gradient of a waveform that indicates motion of the operation shaft (26) and represents a relationship between a position of the operation shaft (26) and a time that elapses since an operating command has been input to the switching device; and an anomaly diagnosis unit (14) that extracts, from a relationship between the time and the gradient calculated, a feature value representing a motion characteristic of the operation shaft (26) and diagnoses whether an anomaly occurs and a factor behind the anomaly that occurs, on the basis of a result of comparison between the extracted feature value and a preset reference value.