Twin-roll type, continuous casting of metal sheets is carried out by pouring a molten metal into the clearance between a pair of rolls, provided with control plates, respectively, and rolling the poured molten metal while solidifying the poured molten metal, under a condition given by:u.gtoreq.d/awherein u is a roll surface speed (m/sec), d is a thickness of the lower edge of each of control plates (mm) and a is a coefficient depending upon the species of molten metal, thereby producing cast pieces in a sheet form.