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PROBLEM TO BE SOLVED : To provide a RFeB based sintered magnet having a high coercive force which is uniform over the entire magnet even in the case of having a relatively large thickness. SOLUTION : A RFeB based sintered magnet comprises : a base material composed of the sintered compact of a RFeB based magnet including a light rare earth element RL consisting of at least one of Nd and Pr, Fe and B; and a heavy rare earth element RH consisting of at least one rare earth element of Dy, Tb and Ho, and diffused in the base material through grain boundaries of the base material. A smallest size portion of the RFeB based sintered magnet is larger than 3 mm in size. A value determined by dividing, by a volume of the RFeB based sintered magnet, a quantity of the heavy rare earth element RH included in the RFeB based sintered magnet is 25 mg/cm3 or larger. In the smallest size portion, the difference between its surface and the center thereof in local coercive force is equal to or smaller than 15% of the local coercive force at the surface thereof. COPYRIGHT : (C)2016, JPO&INPIT