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In the continuous casting of steel, the phenomenon in which the solidified shell bulges due to the ferrostatic pressure of the molten steel as the slab passes through the series of rolls in the continuous casting machine is called inter-roll bulging. As inter-roll bulging is caused by elasto-plastic deformation, the bulging of the solidified shell which occurs between the rolls does not completely return to its original shape when the slab moves to the next roll. This means the slab has a bulging shape as it moves through the caster. Because the volume of molten steel in the slab changes at each roll, the mold level fluctuates at the roll pitch cycle. This phenomenon is called mold level fluctuation caused by unsteady bulging, and affects the surface quality of the product and stable operation of the continuous casting process. Various approaches such as increasing the amount of secondary cooling water1) and adoption of a non-cyclic roll pitch2) have been taken to suppress unsteady bulging. Inter-roll bulging and unsteady bulging have been measured in a number of studies. Saeki et al.3) measured the Generation Mechanism of Unsteady Bulging in Continuous Casting-1 -Development of Method for Measurement of Unsteady Bulging in Continuous Casting-