R-T-B BASED SINTERED MAGNET

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An R-T-B based sintered magnet according to the present invention comprises : 12 at % to 15 at % of a rare-earth element R; at % to 8.0 at % of boron B; 0.02 at % to 0.2 at % of Mn; and a transition metal T as the balance. The rare-earth element R is at least one element selected from the rare-earth elements, including Y (yttrium), and includes 0.2 at % to 8 at % of Pr. And the transition element T includes Fe as its main element.