To obtain a high electric resistance and a good durability to solvent, by binding rare-earth magnet powder particles using silicon oxide and/or aluminum oxide particles.

Nd-Fe-B isotropic magnet powder formed by an ultra-rapid cooling method is used. A liquid inorganic binder formed by dispersing SiO2 particles with an average grain size of 10-100 nm in a solution adjusted at pH B-12 is prepared. Then, the magnet powder adjusted to approximately 500 μm or less and the inorganic binder are kneaded, and dehydration and drying are carried out by a rotary pump at room temperatures. Next, the resultant material is crushed by a disk mill. After pure water of pH 7-12 is added to the crushed material powder, the material powder is molded. The compact thus obtained is hardened in a N2 flow under a heating condition of room temperatures to 200°C, thus providing a bulk-like rare-earth magnet of high electric resistance.