ROLL STATUS MONITORING DEVICE

A roll state monitor device comprising:rolling force detecting means (6) configured to detect a rolling force signal of a monitored roll selected from an upper roll set (3, 4) and a lower roll set when a rolled material (1) is rolled between the upper roll set (3, 4) and the lower roll set, the upper roll set (3, 4) having at least one roll and the lower roll set having at least one roll;signal extracting means (210) extracting from the rolling force signal a rolling force high frequency signal having a frequency equal to or larger than a predetermined frequency which is set in advance; androll state determining means (212) configured to determine a state of the monitored roll based on a test result of a statistical test method for a plurality of rolling force values included in the rolling force high frequency signal.