A manufacturing method of a rare earth magnet

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Provided is a method for producing an alloy piece for a rare earth magnet by feeding a molten alloy to an outer peripheral surface of a cooling roll (3) and solidifying the same to cast an ingot (4) and then breaking the ingot (4), wherein subjecting the outer peripheral surface of the cooling roll (3) to a blast treatment and removing adhered matter from the outer peripheral surface of the cooling roll (3) makes it possible to reduce a variance in the crystal structure in the resulting alloy piece. Preferably, a projecting material that has a median diameter D50 of 3.0 mm or lower and includes one or more types from among a metallic projecting material, non-metallic projecting material, and a resin-based projecting material is used as a projecting material when implementing the blast treatment. Also, preferably, the discharge pressure is 0.10-1.00 MPa when implementing the blast treatment.