Patent ID: 8877644

Claim:
A polishing method comprising a step in which a copper-containing metal film is polished using a polishing solution to remove at least a portion of the copper-containing metal film at a polishing rate of 30,000 Å/min or greater, the polishing solution comprising: a first organic acid component which is at least one type selected from among an organic acid containing a hydroxyl group, a salt of the organic acid and an anhydride of the organic acid; an inorganic acid component which is at least one type selected from among a dibasic or greater inorganic acid and a salt of the inorganic acid; an amino acid; a protective film-forming agent; an abrasive grain; an oxidizing agent; and water, wherein a content of the inorganic acid component in terms of inorganic acid is 0.15 mass % or greater, a content of the amino acid is 0.30 mass % or greater, a content of the protective film-forming agent is 0.10 mass % or greater, based on an entire polishing solution, and a ratio of a content of the first organic acid component in terms of organic acid with respect to a content of the protective film-forming agent is at least 1.5.