To provide a hot carrier device and a hot carrier method for coagulation slag that can efficiently collect sensible heat of the coagulation slag.

An upper surface of molten slag 3 poured from a feeding device 4 into a casting mold 21 continuously transferred is fabricated at a horizontal transferring part 22a and the casting mold 21 is transferred horizontally while the fabrication is being carried out, the casting mold 21 is transferred up to a loading shoot 72 of a heat recovery device 7 at an oblique transferring part 22b in continuous with the horizontal transferring part 22a, and the formed coagulation slag 6 is loaded into the heat recovery device 7. With this operation, the coagulation slag 6 fabricated against irregularity is transferred to the heat recovery device 7 while being kept at high temperature to restrict reduction in temperature and thus it is possible to perform an efficient recovery of the sensitive heat from the coagulation slag 6.