Manufacturing method of hot-rolled steel sheet

A manufacturing method of a hot-rolled steel sheet, wherein cooling water is sprayed at an inside of a housing of a final stand on a lower process side of the final stand, which is disposed on an end on the lower process side in a row of hot finishing mills, to rapidly cool a rolled material;

• a surface temperature of the rolled material is measured on an entry side of the final stand, to obtain an entry-side surface temperature;
• and
• an entry-side target surface temperature, which is a target surface temperature of the rolled material at the measurement position of the entry-side surface temperature, is calculated from an exit-side target surface temperature, which is a target surface temperature of the rolled material on an exit side of the final stand, based on:
• a temperature increase by a heat generated by rolling processing in the final stand;
• a temperature reduction by contact of a work roll in the final stand with the rolled material;
• and a temperature reduction by air cooling in transportation from the measurement position of the entry-side surface temperature to the work roll of the final stand.