The sub-lance according to the present invention has a body, a nozzle having a plurality of heat sinks coupled to the body and protruding from the inner surface having a flow path therein, a probe coupled to the nozzle, and through holes connected to the flow path through the interior. And a reinforcing member provided inside the body and the nozzle corresponding to a position at which the body and the nozzle are coupled to each other. Therefore, the rigidity of the portion where the body of the sub lance and the nozzle are coupled by the reinforcing member is improved, and thus the appearance of the sub lance can be prevented from being deformed during the operation. In addition, the heat sink can improve the cooling effect of the nozzle to prevent it from being attached to the nozzle during the operation, as well as to improve the rigidity of the nozzle to prevent the appearance of the nozzle from being deformed.
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