To provide a facility information management device for detecting illegal alteration of facility data, and for notifying a system manager of the risk.

In the facility information management device, a management device 20 which manages facility information is connected through a communication network 11 to an input device 10, and the facility information is updated from an input device 10. The management device 20 is provided with: a facility data part 22 for storing facility information to be managed; a history data part 23 for storing update history information including at least an update user and an update date and an update facility as the history of the update of the facility information; an input/output part 21 for storing the updated facility information in a facility data part each time the update request of the facility information is made from the input device, and for storing the update history information in the history data part; and a mass update inspection part 25 for sorting the update history information from the history data part for each update user and update date, and for providing warning information to a system manager when there is a large amount of update history information in a fixed time.