NOVELTY - Manufacture of rare-earth permanent magnet involves disposing a powder mixture on a surface of a sintered magnet component containing a composition, and heat-treating the sintered magnet component at a temperature lower than or equal to the sintering temperature of the sintered magnet component in vacuum or an inert gas to diffuse to grain boundaries in the interior of the sintered magnet component and/or near grain boundaries within the sintered magnet component primary phase grains. The alloy powder(s) contains an intermetallic compound phase (70 volume% or more).    USE - Manufacture of rare-earth permanent magnet (claimed) used for industrial equipment, electric automobiles and wind-power generators.    ADVANTAGE - The method provides rare-earth permanent magnet with increased coercive strength while minimizing decline of remanence and improved magnetic property.    DETAILED DESCRIPTION - Manufacture of rare-earth permanent magnet involves disposing a powder mixture on a surface of a sintered magnet component containing a composition of formula: RaT1bMcBd, where R is yttrium and/or scandium, T1 is iron and/or cobalt, M is aluminum, silicon, carbon, phosphorus, titanium, vanadium, chromium, manganese, nickel, copper, zinc, gallium, germanium, zirconium, niobium, molybdenum, silver, indium, tin, antimony, hafnium, tantalum, tungsten, lead and/or bismuth, B is boron, a is 12-20, c is 0-10, d is 4-7, a+b+c+d=100, and b is remainder, and heat-treating the sintered magnet component at a temperature lower than or equal to the sintering temperature of the sintered magnet component in vacuum or an inert gas to diffuse to grain boundaries in the interior of the sintered magnet component and/or near grain boundaries within the sintered magnet component primary phase grains. The powder mixture comprises an R2 oxide (10 weight% or more), where R2 is R, and an alloy powder (A) containing composition of formula: R1iM1j where R1 is R, M1 is M, j is 15-99, remainder of i and i+j is 100, an alloy powder (B) containing composition of formula: R1iM1jHk where H is hydrogen and i+j+k is 100, an alloy powder (C) containing the composition of formula: R1xT2yM1z where x is 5-85, z is 15-95, x+z is 100 or less, y is 0 or more and x+y+z is 100, or an alloy powder (D) containing composition of formula: M1dM2e where M2 is M, e is 99.9 or less, remainder of d and d+e is 100. The alloy powder(s) contains an intermetallic compound phase (70 volume% or more). The alloy powder(s) have average particle size of 500 mu m or less. The powder mixture an average particle size of 100 mu m or less. An INDEPENDENT CLAIM is included for rare-earth permanent magnet.