Immersion nozzle

The invention relates to an immersion type water gap, which is provided with a vertically tubular straight cylinder part (10) and a pair of steel flowing holes (12) in bilateral symmetry. The straight cylinder part (10) is used for allowing molten steel to pass downwards from a molten steel introducing part (9) at the upper end; the lower part of the straight cylinder part (10) is provided with the steel flowing holes (12) which make the molten steel discharged towards the transverse direction from the lateral surface of the straight cylinder part; the inner wall surface of each steel flowinghole (12) is parallel to the longitudinal direction of a central axis of the steel flowing hole (12), and the length of the introducing part formed by the inner wall surface is more than 45 millimeters; the total section area of the steel flowing hole is set as S1, the section area of an inner hole of the straight cylinder part positioned at the upper end of the steel flowing hole of the straightcylinder part and forming