A swarf-guiding device guides stringy swarf continuously generated from a cut point. The swarf-guiding device includes a jet nozzle that jets coolant, a nozzle-holding device that holds the jet nozzle such that a position and an orientation of the jet nozzle are changeable, and a controller that controls the nozzle-holding device such that the coolant hits the stringy swarf at a downstream position from a cut point in a tool-feeding direction.