Disclosed is a sub-lance. According to an embodiment of the present invention, a sub-lance comprises: a sub-lance body; a probe holder coupled to the sub-lance body by a screw fastening method; and a probe branch tube slidably engaged with an outer surface of the probe holder, providing a rotation guiding means on an outer surface of the probe holder to guide rotation of the probe holder in a direction to which the probe holder is to be fastened to the sub-lance body by a frictional force generated with an inner surface of the probe branch tube when the probe branch tube moves slidably to be coupled to the probe holder.;COPYRIGHT KIPO 2016
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