A method for producing hematite for ironmaking by a process where a mineral acid and an oxidizing agent are added to a nickel oxide ore and then nickel is leached at high temperatures and high pressures, the method comprising the steps of: a high pressure acid leach step of adding the mineral acid and the oxidizing agent to the nickel oxide ore and leaching the nickel contained in the nickel oxide ore under high temperatures and high pressures to obtain a leachate and then adding at least one or more of a base rock, magnesium hydroxide, and magnesium oxide as a neutralizing agent to the leachate for neutralization treatment to form a leach slurry; a preliminary neutralization step of adding at least one or more of a base rock, magnesium hydroxide, and magnesium oxide as a neutralizing agent to the leach slurry for neutralization treatment to form a slurry after preliminary neutralization including a nickel-enriched component and an iron-enriched component that have been separated by the neutralization treatment; a first solid-liquid separation step of subjecting the slurry after preliminary neutralization formed by the preliminary neutralization step to solid-liquid separation to separate the slurry into a nickel-enriched slurry (liquid component) and an iron-enriched slurry (solid component) with washing; a first neutralization step of neutralizing the nickel-enriched slurry obtained by the first solid-liquid separation step using a calcium-based neutralizing agent; a second neutralization step of neutralizing the iron-enriched slurry obtained by the first solid-liquid separation step using a non-calcium-based neutralizing agent; a third solid-liquid separation step of subjecting the iron-enriched slurry after neutralization produced through the second neutralization step to solid-liquid separation and washing to produce hematite as a solid component; seed crystal addition treatment of adding, as seed crystals, a part of the iron-enriched slurry obtained in the first solid-liquid separation step to the first neutralization step of neutralizing the nickel-enriched slurry; a second solid-liquid separation step of subjecting a precipitate obtained from the first neutralization step using the nickel-enriched slurry to solid-liquid separation to separate the precipitate into a residue (solid component) containing a sulfur compound and a liquid component which does not contain sulfur, with washing: and a baking step of baking the hematite obtained in the third solid-liquid separation step at 1150 to 1350°C. a high pressure acid leach step of adding the mineral acid and the oxidizing agent to the nickel oxide ore and leaching the nickel contained in the nickel oxide ore under high temperatures and high pressures to obtain a leachate and then adding at least one or more of a base rock, magnesium hydroxide, and magnesium oxide as a neutralizing agent to the leachate for neutralization treatment to form a leach slurry; a preliminary neutralization step of adding at least one or more of a base rock, magnesium hydroxide, and magnesium oxide as a neutralizing agent to the leach slurry for neutralization treatment to form a slurry after preliminary neutralization including a nickel-enriched component and an iron-enriched component that have been separated by the neutralization treatment; a first solid-liquid separation step of subjecting the slurry after preliminary neutralization formed by the preliminary neutralization step to solid-liquid separation to separate the slurry into a nickel-enriched slurry (liquid component) and an iron-enriched slurry (solid component) with washing; a first neutralization step of neutralizing the nickel-enriched slurry obtained by the first solid-liquid separation step using a calcium-based neutralizing agent; a second neutralization step of neutralizing the iron-enriched slurry obtained by the first solid-liquid separation step using a non-calcium-based neutralizing agent; a third solid-liquid separation step of subjecting the iron-enriched slurry after neutralization produced through the second neutralization step to solid-liquid separation and washing to produce hematite as a solid component; seed crystal addition treatment of adding, as seed crystals, a part of the iron-enriched slurry obtained in the first solid-liquid separation step to the first neutralization step of neutralizing the nickel-enriched slurry; a second solid-liquid separation step of subjecting a precipitate obtained from the first neutralization step using the nickel-enriched slurry to solid-liquid separation to separate the precipitate into a residue (solid component) containing a sulfur compound and a liquid component which does not contain sulfur, with washing: and a baking step of baking the hematite obtained in the third solid-liquid separation step at 1150 to 1350°C.