Continuous casting method for slab casting piece

Provided is a continuous casting method that can manufacture a high quality slab casting piece. In the continuous casting method, a submerged nozzle is disposed within a casting mold for continuous casting, and molten steel is supplied to the submerged nozzle for casting. The submerged nozzle has a pair of discharge holes disposed symmetrically with respect to the vertical axis thereof. The submersion depth is 180 mm or greater and less than 300 mm, the molten steel discharge angle is in a range of 15 - 35 DEG, and the ratio A/P for blown-in inert gas flow rate A and molten steel throughput P is in a range of 2.0 - 3.5 NL/ton. The discharge direction of the submerged nozzle is inclined within the range of Equation (1) with respect to a reference plane parallel with a long side surface of the casting mold and passing through the vertical axis center of the submerged nozzle. [Theta] ? 6 ≤ [alpha] ≤ [Theta] + 10 ... (1) In Equation (1), [alpha] is the angle of inclination to the reference plane, and [Theta] is a