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Recently, many new materials are used in the electronic equipment of automobiles in the pursuit of safety, economy and comfort. NEOMAX magnets are being developed and produced by Sumitomo Special Metals to meet these specific needs. The maximum energy values of NEOMAX magnets exceed those obtainable by Sm-Co magnets. In addition, with the use of plentiful neodimium and iron as the main constituents, good cost performance is expected. This paper gives a summery of the various magnetic properties of NEOMAX magnets - temperature dependence of saturation magnetization, energy product, magnetic flux density, permeance coefficient, demagnetization curve, thermal demagnetization factor -, of the effect of replacement of Fe with Co in Nd2Fe14B and of Nd with Dy in Nd15Fe77B8 and of the surface treating methods and their reliability.