Failure classifying device, failure classifying method, and failure classifying program for specifying locations of failures in a machine

Provided are a failure classifying device, a failure classifying method, and a failure classifying program capable of specifying the causes of failures even when a controller does not generate an alarm. A failure classifying device includes: a failure unit acquiring unit that acquires a data set in which a failure unit of a machine is correlated with one or a plurality of constituent parts; a failure history acquiring unit that acquires a failure history including events of failures that occurred in the past and countermeasure parts; and a correlating unit that stores information on one or a plurality of events in correlation with the failure unit by matching the constituent part to the countermeasure part.