PURPOSE: To manufacture a rare-earth magnetic minute powder without pulverizing an ingot or a ribbon material by a method wherein an aqueous solution of a salt of an iron group three-membered element and a rare-earth element is added to an aqueous solution containing a specific reducing agent.

CONSTITUTION: Chloride or sulfate of an iron group three-membered element (iron, cobalt, nickel) and a rare-earth element is added to an aqueous solution containing a reducing agent such as a hydroride of boron kalium, a hydroride of boron sodium, or the like and a reducing agent of dimethylamine boron, whereby a rare-earth magnetic minute powder can be made. For example, after an aqueous solution of a hydroride of boron kalium is dropped into an aqueous solution containing FeSO4, NdCl3, and dimethylamine boron, it is left as it is for 10min. and the Nd-Fe-B minute powder is separated out. After the separated matter is filtered through a glass filter, washed by distilled water, washed by methanol, and washed by acetone, it is dried under vacuum along with the glass filters. Incidentally, it is desired that the amount of the hydroride of boron kalium should be suppressed down to a half of the reaction conclusion amount or less which is calculated in an atoichiometry method.