R-T-B BASED RARE EARTH PERMANENT MAGNET, MOTOR, AUTOMOBILE, POWER GENERATOR AND WIND ENERGY CONVE

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Provided is an R-T-B based rare earth permanent magnet wherein a high coercivity (Hcj) can be achieved without increasing the Dy concentration in an R-T-B based alloy and deterioration in magnetization (Br), said deterioration being caused by the addition of Dy, can be inhibited to thereby give excellent magnetic characteristics. The R-T-B based rare earth permanent magnet comprises a sintered body comprising a primary phase, which contains R2Fe14B as the main component, and a grain boundary phase, which contains R in a larger amount than the primary phase, wherein : R represents a rare earth element containing Nd as an essential element; said sintered body contains Ga as an essential element; said grain boundary phase comprises a primary grain boundary phase, a secondary grain boundary phase and a tertiary grain boundary phase, these grain boundary phases being different in total atomic concentration of rare earth elements from each other; and said tertiary grain boundary phase has a lower total atomic concentration of said rare earth elements than the primary and secondary grain boundary phases, and has a higher atomic concentration of Fe than the primary and secondary grain boundary phases.