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The present invention addresses the problem of providing a RFeB-based sintered magnet that essentially does not contain heavy rare earth elements RH(Dy, Tb, and Ho) and that is suitable for applications in which the temperature increases during use. The RFeB-based sintered magnet pertaining to the present invention contains, in addition to Fe and B, Nd and/or Pr as the rare earth element R, and does not contain Dy, Tb, or Ho, wherein the temperature characteristic value t(100-23) defined as set out in FF using the coercive force value Hcj(23) when the temperature is 23°C and the coercive force value Hcj(100) when the temperature is 100°C is 0.58 < t(100-23) < 0.