An object of the present invention is to provide an oligosaccharide preparation having suppressed hygroscopicity and good storage stability while maintaining preferred physiological functions of oligosaccharides, and a method for producing the same. According to the present invention, there are provided a method for producing an oligosaccharide preparation comprising: step (a) of dissolving an oligosaccharide and acacia fiber in a solvent to give a solution and step (b) of spray-drying, vacuum-drying or freeze-drying the solution obtained in the step (a), and, optionally, step (c) of granulation, and an oligosaccharide preparation produced by the production method.
