Permanent magnet

A permanent magnet comprising:

• 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,
• wherein the grain boundary diffusion metal includes a praseodymium (Pr)—X—Y alloy disposed at the grain boundary,
• wherein an elemental content of the X includes a region in which the content increases from the crystal grain toward the crystal grain boundary, and
• wherein an elemental content of each of the praseodymium and the X in the crystal grain boundary decreases as a distance from the crystal grain increases.