PURPOSE: To efficiently remove water droplets by coating water repellent on the side end surface of a rolled stock and rolling it and spraying compressed air from the surface of the rolled stock when the rolled stock is rolled by emulsion type rolling oil.

CONSTITUTION: A water repellent-adhesion device 12 to adhere water repellent having repellency to the end face of the rolled stock before rolling is performed, an emulsion spraying device 14 to spray emulsion type rolling oil to the upper and lower surfaces of the rolled stock 1 and an air injection system 16 to inject the air to the upper and lower surfaces after rolled toward the outside in the width direction are arranged on a rolling mill 10. Although the water droplets adheres to the end faces of the rolled stock 1 while the rolling stock 1 is being rolled. The adherent water droplets D are easy to be repelled by the action of the repellent cannot support the weight of the water droplets by surface tension, but can be removed by the injection air of the air injection system 16.