Cooling device, manufacturing method, and manufacturing line for hot rolled steel band

The present invention relates to a cooling apparatus for hot rolled steel strip comprising: an upper means for cooling an upper side of a steel strip transported by transporting rolls after hot rolling, located above the upper side of the steel strip; and a bottom means for cooling the bottom side of the steel strip, located under the bottom side of the steel strip, each means for cooling including: a protecting member having at least one cooling water hole slotted thereon, located near the surface of the steel strip; at least one cooling water header, located across the steel strip from the protecting member; and cooling water injection nozzles for injecting cooling water vertically onto the surface of the steel strip through the cooling water hole, projected on the cooling water header, wherein the top of the cooling water injection nozzle is positioned at a longer distance from the surface of the steel strip than the surface of the protecting member facing to the surface of the steel strip. The present invention allows to constantly transport the steel strip after hot rolling and to rapidly and homogeneously cool it.