A method of producing hematite for ironmaking by a process of adding a mineral acid and an oxidizing agent to an ore containing iron and nickel and then leaching the nickel under high temperature and pressure, the method comprising: a high-pressure acid leaching step of adding a base rock or magnesium hydroxide as a neutralizing agent to a leachate, that is obtained under the high temperature and pressure, for neutralization of the leachate to form a leach slurry; a preliminary neutralization step of converting the leach slurry into a slurry after preliminary neutralization composed of a Ni-enriched slurry and an Fe-enriched slurry; a first solid-liquid separation step of solid-liquid separating the slurry after preliminary neutralization that is obtained in the preliminary neutralization step, into the Ni-enriched slurry and the Fe-enriched slurry with washing; a neutralization step of neutralizing the Ni-enriched slurry that is obtained in the first solid-liquid separation step, with limestone or slaked lime as a neutralizing agent; a second neutralization step of neutralizing the Fe-enriched slurry that is obtained in the first solid-liquid separation step, with sodium hydroxide or potassium hydroxide as a neutralizing agent; a third solid-liquid separation step of solid-liquid separating the Fe-enriched slurry that is neutralized in the second neutralization step into a liquid component and hematite as a solid component, with washing; a step of adding part of the Fe-enriched slurry that is obtained in the first solid-liquid separation step, as a seed crystal in the neutralization step of neutralizing the Ni-enriched slurry; and a second solid-liquid separation step of solid-liquid separating a precipitate that is obtained from the neutralization step of neutralizing the Ni-enriched slurry, with washing. a high-pressure acid leaching step of adding a base rock or magnesium hydroxide as a neutralizing agent to a leachate, that is obtained under the high temperature and pressure, for neutralization of the leachate to form a leach slurry; a preliminary neutralization step of converting the leach slurry into a slurry after preliminary neutralization composed of a Ni-enriched slurry and an Fe-enriched slurry; a first solid-liquid separation step of solid-liquid separating the slurry after preliminary neutralization that is obtained in the preliminary neutralization step, into the Ni-enriched slurry and the Fe-enriched slurry with washing; a neutralization step of neutralizing the Ni-enriched slurry that is obtained in the first solid-liquid separation step, with limestone or slaked lime as a neutralizing agent; a second neutralization step of neutralizing the Fe-enriched slurry that is obtained in the first solid-liquid separation step, with sodium hydroxide or potassium hydroxide as a neutralizing agent; a third solid-liquid separation step of solid-liquid separating the Fe-enriched slurry that is neutralized in the second neutralization step into a liquid component and hematite as a solid component, with washing; a step of adding part of the Fe-enriched slurry that is obtained in the first solid-liquid separation step, as a seed crystal in the neutralization step of neutralizing the Ni-enriched slurry; and a second solid-liquid separation step of solid-liquid separating a precipitate that is obtained from the neutralization step of neutralizing the Ni-enriched slurry, with washing.