R-T-B rare earth sintered magnet

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The invention provides an R-T-B rare earth sintered magnet 100 including R 2 T 14 B-containing crystal grains as the main phase 10, and having an R L -T-M 1 based compound 12 at the grain boundary triple points, wherein R represents a rare earth element, T represents at least one element selected from among Fe, Co and Cu, B represents boron, R L represents a light rare earth element, and M 1 represents at least one element selected from among Al, Zn and Ga.