Abstract: A permanent magnet according to an embodiment includes a Re—Fe—B base magnet; and a grain boundary diffusion metal disposed inside the base magnet, wherein the base magnet includes a plurality of crystal grains, and a grain boundary between the plurality of crystal grains, the grain boundary diffusion metal includes a praseodymium (Pr)—X—Y alloy disposed at the grain boundary, the X includes at least one metal selected from copper (Cu), aluminum (Al), and gallium (Ga), and the Y includes at least one metal selected from titanium (Ti), tungsten (W), niobium (Nb), rhenium (Re), and molybdenum (Mo).