METHOD FOR MEASURING ROLL PROFILE

PROBLEM TO BE SOLVED: To provide a high-precision roll profile measuring method by suppressing occurrence of the form evaluation error of a law-order mode. SOLUTION: A displacement detector fitting stage set along an axis line direction of a work roll 2 for reciprocating movement, and a pair of displacement detectors 3h ands 3i which, set on the displacement detector fitting stage with an interval Le , measures surface rough amount in the axis line direction of the work roll are used. Here, the displacement detector fitting stage is moved along the axis line direction of the work roll to measure the surface rough of the work roll over the entire length, and the synthetic measurement value data series obtained from a difference between measured values obtain by the displacement detector are calculated, thus the surface rough amount in the axis line direction of the work roll is obtained.