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PROBLEM TO BE SOLVED : To provide inexpensive ferrite magnet powder that has excellent magnet characteristics in a stoichiometric composition and even in a composition region which is slightly excessive in AO than the stoichiometric composition, and to provide a method of manufacturing the magnet powder and an inexpensive bonded magnet that is improved in characteristics by using the magnet powder.SOLUTION : To ferrite magnet powder is composed of the single phase of the magnetoplumbite type crystal structure expressed by the chemical formula of (A1-xRx)O-n[(Fe3+1-yFe2+y)2O3] and has a mean particle diameter of 0.5-3.0 μm. In the chemical formula, the reference symbol A denotes at least one kind of element selected out of Ba and Sr, and the reference symbol R denotes at least one kind of element selected from among rare-earth elements. In addition, x, y, and n denote mole ratios and are respectively adjusted to meet 0
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