PURPOSE: To heat efficiently a blank material and to prevent troubles of product caused by insufficient heating by heating the side ends of a blank-material coil in manufacturing a thin sheet by hot finish-rolling the material.

CONSTITUTION: A hot finish-rolling blank material 32 after thickness reduction rolling, is wound up into a coil 29 by a coiler. Next, the sheet-width end faces of the coil 29 and/or a coil 30 on an unwinding device 28, are heated by a coil end-face heating device 62. The coil is successively rolled by a hot finishing mill 31. In this way, the end faces of blank material are sufficiently heated, and the troubles of product such as the cracks in the sheet width ends or the generation of an inferior crystal structure are prevented.