A finger/palm print image processing system comprising: a frequency component analysis unit configured to perform a frequency analysis on each of plural small regions into which a finger/palm print image is divided, and to select representative frequency components that approximate each of the plural small regions by a two-dimensional sinusoidal wave; and a frequency component judgment unit configured to make a first judgement of judging clarity of ridgelines of the small regions based on the representative frequency components, wherein: said finger/palm print image indicates at least one of a finger print and a palm print; characterized in that said frequency component analysis unit is further configured to perform a frequency analysis on a center portion of the small region in order to select first representative frequency components, and to perform a frequency analysis on the small region including peripheral portions in order to select second representative frequency components; and said frequency component judgment unit is further configured to make a second judgement of judging the small region to be a region having a fine structure, such as characterizing points, of ridgelines if a difference exists between the first and second representative frequency components, or judging the small region to be a region having a monotonous flow of ridgelines if no difference exists between the first and second representative frequency components. a frequency component analysis unit configured to perform a frequency analysis on each of plural small regions into which a finger/palm print image is divided, and to select representative frequency components that approximate each of the plural small regions by a two-dimensional sinusoidal wave; and a frequency component judgment unit configured to make a first judgement of judging clarity of ridgelines of the small regions based on the representative frequency components, wherein: said finger/palm print image indicates at least one of a finger print and a palm print; characterized in that said frequency component analysis unit is further configured to perform a frequency analysis on a center portion of the small region in order to select first representative frequency components, and to perform a frequency analysis on the small region including peripheral portions in order to select second representative frequency components; and said frequency component judgment unit is further configured to make a second judgement of judging the small region to be a region having a fine structure, such as characterizing points, of ridgelines if a difference exists between the first and second representative frequency components, or judging the small region to be a region having a monotonous flow of ridgelines if no difference exists between the first and second representative frequency components. said finger/palm print image indicates at least one of a finger print and a palm print; characterized in that said frequency component analysis unit is further configured to perform a frequency analysis on a center portion of the small region in order to select first representative frequency components, and to perform a frequency analysis on the small region including peripheral portions in order to select second representative frequency components; and said frequency component judgment unit is further configured to make a second judgement of judging the small region to be a region having a fine structure, such as characterizing points, of ridgelines if a difference exists between the first and second representative frequency components, or judging the small region to be a region having a monotonous flow of ridgelines if no difference exists between the first and second representative frequency components.