R a-T a-B based sintered magnet

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A step of providing an R1-T1-X (where R1 is mainly Nd; T1 is mainly Fe; and X is mainly B) based sintered alloy compact mainly characterized by a molar ratio of [T1]/[X] being 13.0 or more; a step or providing an R2-Ga—Cu (where R2 is mainly Pr and/or Nd and accounts for not less than 65 mol % and not more than 95 mol %; and [Cu]/([Ga]+[Cu]) is not less than 0.1 and not more than 0.9 by mole ratio) based alloy; and a step of, while allowing at least a portion of a surface of the R1-T1-X based sintered alloy compact to be in contact with at least a portion of the R2-Ga—Cu based alloy, performing a heat treatment at a temperature which is not less than 450° C. and not more than 600° C.