Rare earth sintered magnet, method for producing rare earth sintered magnet, rotor, and rotary machine

A rare earth sintered magnet comprising:

• a main phase that satisfies a general formula (Nd, Pr, RH, R)—Fe—B, where RH is a heavy rare earth element including at least one of Dy or Tb, R is one or more rare earth elements selected excluding Nd, Pr, Dy, and Tb, the main phase containing crystal grains based on an Nd2Fe14B crystal structure;
• and
• a subphase present between a plurality of the main phases, wherein
• the main phase includes a core portion and a shell portion covering the core portion,
• the main phase includes a first main phase that satisfies CNd>CPr and a second main phase that satisfies CNd<CPr, where CNd is concentration of Nd in the core portion and CPr is concentration of Pr in the core portion,
• concentration of the heavy rare earth element RH in the core portion of the first main phase is higher than concentration of the heavy rare earth element RH in the core portion of the second main phase,
• the first main phase and the second main phase are provided mixedly, and
• the heavy rare earth element RH is present on at least a part of a surface of the first main phase and the second main phase.