A process for producing a particulate composition consisting of pullulan and concomitant saccharides containing mannitol, which comprises the steps of: culturing a microorganism of the species Aureobasidium pullulans in a culture medium comprising a saccharide mixture containing glucose and maltose as carbon sources; removing the cells from the resulting culture; and decoloring, desalting, concentrating, and pulverizing the resultant; wherein said microorganism has the property that the yield (%) of concomitant saccharides is not higher than 3%; wherein said saccharide mixture containing glucose and maltose has the dextrose equivalent of 50 to 90; wherein said microorganism has the property that the ratio of "the yield(%) of concomitant saccharides" against "the yield(%) of pullulan against saccharides" is 0.05 or lower; wherein said "yield (%) of concomitant saccharides" is defined by the following equation: yield % of concomitant saccharides = { ( Concentration % of concomitant saccharides) / ( Concentration % of carbon sources of culture medium)} × 100; wherein said "yield (%) of pullulan against saccharides" is defined by the following equation: yield % of pullulan against saccharides = { ( Concentration % of pullulan) / ( Concentration % of carbon sources of medium)} × 100; wherein said process does not contain a step of removing concomitant saccharides; and wherein said particulate composition has the following features to: said pullulan and said concomitant saccharides are respectively insoluble and soluble in 75% by volume of methanol in water; the content of said pullulan against the content of the total saccharides in the whole of said particulate composition is 97% by weight or higher, when determined based on the anthrone sulfuric acid method; the content of said concomitant saccharides against the content of the total saccharides in the whole of said particulate composition is 3% by weight or lower, when determined based on the anthrone sulfuric acid method; and the content of said mannitol does not exceed 2% by weight, on a dry solid basis. culturing a microorganism of the species Aureobasidium pullulans in a culture medium comprising a saccharide mixture containing glucose and maltose as carbon sources; removing the cells from the resulting culture; and decoloring, desalting, concentrating, and pulverizing the resultant; wherein said microorganism has the property that the yield (%) of concomitant saccharides is not higher than 3%; wherein said saccharide mixture containing glucose and maltose has the dextrose equivalent of 50 to 90; wherein said microorganism has the property that the ratio of "the yield(%) of concomitant saccharides" against "the yield(%) of pullulan against saccharides" is 0.05 or lower; wherein said "yield (%) of concomitant saccharides" is defined by the following equation: yield % of concomitant saccharides = { ( Concentration % of concomitant saccharides) / ( Concentration % of carbon sources of culture medium)} × 100; wherein said "yield (%) of pullulan against saccharides" is defined by the following equation: yield % of pullulan against saccharides = { ( Concentration % of pullulan) / ( Concentration % of carbon sources of medium)} × 100; wherein said process does not contain a step of removing concomitant saccharides; and wherein said particulate composition has the following features to: said pullulan and said concomitant saccharides are respectively insoluble and soluble in 75% by volume of methanol in water; the content of said pullulan against the content of the total saccharides in the whole of said particulate composition is 97% by weight or higher, when determined based on the anthrone sulfuric acid method; the content of said concomitant saccharides against the content of the total saccharides in the whole of said particulate composition is 3% by weight or lower, when determined based on the anthrone sulfuric acid method; and the content of said mannitol does not exceed 2% by weight, on a dry solid basis. said pullulan and said concomitant saccharides are respectively insoluble and soluble in 75% by volume of methanol in water; the content of said pullulan against the content of the total saccharides in the whole of said particulate composition is 97% by weight or higher, when determined based on the anthrone sulfuric acid method; the content of said concomitant saccharides against the content of the total saccharides in the whole of said particulate composition is 3% by weight or lower, when determined based on the anthrone sulfuric acid method; and the content of said mannitol does not exceed 2% by weight, on a dry solid basis.