A segment for a continuous casting machine, the segment comprises: upper and lower frames (100, 102) vertically spaced apart from each other; a plurality of rollers (120, 122) respectively disposed in the upper and lower frames (100, 102), the plurality of rollers (120, 122) being arranged in a width direction of a strand; a cooling apparatus spraying coolant between the plurality of rollers (120, 122); a driving unit disposed in an upper central portion of each of the upper frame and the lower frame; coolant spray units (220, 220') respectively disposed on both sides of the driving unit, each of the coolant spray units (220, 220') having at least one nozzle through which the coolant is sprayed; and a moving unit disposed between the driving unit and the coolant spray unit (220, 220') to symmetrically move the coolant spray units (220,220'), characterised in that the moving unit comprises: a rotation shaft horizontally connected to the driving unit and having a screw formed along an outer circumferential surface thereof; a rod having one side connected to the coolant spray unit (220, 220'), the rod being disposed inclined toward the inside of the segment and having a sawtooth formed on an outer circumferential surface thereof along a longitudinal direction; and a motion conversion unit disposed between the rotation shaft and the rod to convert a rotation motion of the rotation shaft into a linear motion, thereby diagonally moving the rod, wherein the motion conversion unit comprises: a plurality of wheels having a sawtooth engaged with the screw of the rotation shaft and the sawtooth of the rod; and a shaft arranged perpendicular to the rotation shaft and used as a rotation shaft for the wheels. upper and lower frames (100, 102) vertically spaced apart from each other; a plurality of rollers (120, 122) respectively disposed in the upper and lower frames (100, 102), the plurality of rollers (120, 122) being arranged in a width direction of a strand; a cooling apparatus spraying coolant between the plurality of rollers (120, 122); a driving unit disposed in an upper central portion of each of the upper frame and the lower frame; coolant spray units (220, 220') respectively disposed on both sides of the driving unit, each of the coolant spray units (220, 220') having at least one nozzle through which the coolant is sprayed; and a moving unit disposed between the driving unit and the coolant spray unit (220, 220') to symmetrically move the coolant spray units (220,220'), characterised in that the moving unit comprises: a rotation shaft horizontally connected to the driving unit and having a screw formed along an outer circumferential surface thereof; a rod having one side connected to the coolant spray unit (220, 220'), the rod being disposed inclined toward the inside of the segment and having a sawtooth formed on an outer circumferential surface thereof along a longitudinal direction; and a motion conversion unit disposed between the rotation shaft and the rod to convert a rotation motion of the rotation shaft into a linear motion, thereby diagonally moving the rod, a rotation shaft horizontally connected to the driving unit and having a screw formed along an outer circumferential surface thereof; a rod having one side connected to the coolant spray unit (220, 220'), the rod being disposed inclined toward the inside of the segment and having a sawtooth formed on an outer circumferential surface thereof along a longitudinal direction; and a motion conversion unit disposed between the rotation shaft and the rod to convert a rotation motion of the rotation shaft into a linear motion, thereby diagonally moving the rod, wherein the motion conversion unit comprises: a plurality of wheels having a sawtooth engaged with the screw of the rotation shaft and the sawtooth of the rod; and a shaft arranged perpendicular to the rotation shaft and used as a rotation shaft for the wheels.