In plate thickness control at the time of rolling the metal material, it is possible to appropriately suppress the periodic disturbance due to roll eccentricity, and, even the best of the rolling stage of the rolled material, and to realize a high-precision thickness control.
Load up and down allocation means for distributing the load in the upper load and a lower load and the upper load and load means up and down fluctuations sympathetic to the lower side load, identifying a variation component of force arising in connection with the rotation position of the roll, a load up and down fluctuations Identification a lower fluctuation component and the variation component of the upper roll kissing when identified by the load means, and having a top and bottom load fluctuation identification storage means for storing for each rotational position of the roll. Manipulated variable calculation means, a load up and down fluctuations identifying means an upper variation component of rolling load and the lower variation identified by the component and the upper and lower Identification load fluctuation upper fluctuation component of the load during a kiss-roll stored in the storage means and based on the lower side fluctuation component to, calculates the roll gap command value.