Continuous casting apparatus for steel

1. A continuous casting apparatus for steel comprising:

a casting mold for casting a molten steel, having a pair of long side walls and a pair of short side walls;

a submerged entry nozzle which discharges the molten steel into the casting mold;

an electromagnetic stirring device arranged along each of the long side wails to stir an upper part of the molten steel within the casting mold; and

an electromagnetic brake device arranged below the electromagnetic stirring device to impart a direct current magnetic field in a casting mold thickness direction, which is along the short side walls, the direct current magnetic field having a flux density distribution which is uniform in a casting mold width direction, which is along each of the long side walls,

wherein a curved portion which is curved toward the electromagnetic stirring device is formed at least at a position where the curved portion faces the submerged entry nozzle on each of the long side walls,

wherein the horizontal distance between a top of the curved portion and the submerged entry nozzle in plan view is equal to or more than 35 mm and less than 50 mm,

wherein the curved portion is formed in an internal surface of each of the long side walls,

the external surface of each of the long side walls is a flat surface, and

wherein the curved portion is formed at a top central position of the internal surface of each of the long side walls.