To provide a device informing outside of equipment operating information after judging the operating state of a mechanical equipment and measuring its operation time, stopping time, the number of stopping times, etc.

When the equipment itself is not capable of judging its operating state or when the equipment is not provided with a means informing outside of the equipment of the judging result though being capable of judging its operating state, a vibration sensor 1 is post-attached to the equipment without modifying the equipment. Then the vibrating state of the equipment is detected to prepare equipment operating, information to display on a display part 8 and to store in a equipment monitoring information data base 7 to monitor the equipment operation time, the number of fault times, etc.