Rare-earth magnetic powder and its manufacturing method, and a resin composition for bonded magnet,

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Provided are a Nd-Fe-B-based magnetic powder and a Sm-Fe-N-based magnetic powder, each of which can improve an anti-corrosive property and heat resistance of a bonded magnet without deteriorating magnetic properties of the bonded magnet. A rare-earth-based magnetic powder according to the present invention comprises a magnetic powder selected from a Nd-Fe-B-based magnetic powder and a Sm-Fe-N-based magnetic powder, wherein the whole areas of the surfaces of particles of the magnetic powder are coated with at least one cyclic siloxane compound selected from the group consisting of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane and 1, 3, 5, 7-tetramethylcyclotetrasiloxane, and wherein the coating amount of the cyclic siloxane compound is 0.1 to 20 parts by mass relative to 1000 parts by mass of the rare-earth-based magnetic powder.