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A method for producing a sintered R-T-B based magnet includes the steps of : providing a sintered R1-T-B based magnet work (where R1 is a rare-earth element; T is Fe, or Fe and Co); providing a powder of an alloy in which a rare-earth element R2 accounts for 40 mass % or more of the entire alloy, the rare-earth element R2 always including Dy and/or Tb; subjecting the powder to a heat treatment to obtain a diffusion source; and heating the sintered R1-T-B based magnet work with the diffusion source to allow the at least one of Dy and Tb contained in the diffusion source to diffuse from the surface into the interior of the sintered R1-T-B based magnet work. The alloy powder is a powder produced by atomization.