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PROBLEM TO BE SOLVED : To provide an effective evaluation method of evaluating the metal structure of a rare earth containing alloy. SOLUTION : A microscopic structure of an R-T-B magnet alloy cross section is read in as a digital image, a straight line of length L substantially parallel to a freezing face of the metal is drawn on the microscopic structure image, an R2T14B main phase and an R-rich phase are determined based on a difference between brightness of the main phase and brightness of an R-rich phase crossed with the straight line, and a value (L/N) provided by dividing the straight line of length L by a frequency N with the brightness on the straight line changed from the brightness judged as the R2T14B main phase up to the brightness judged as the R-rich phase, is evaluated as an R-rich phase interval r, in the evaluation method of evaluating the metal structure of the R-T-B magnet alloy in the present invention. COPYRIGHT : (C)2008, JPO&INPIT