The objects of the present invention are to provide a novel nystose crystal-containing powder which has fluidity suitable for handling and shows a suppressed powder-blown-up phenomenon, and to provide a method for producing the same. According to the present invention, a nystose crystal-containing powder is provided, wherein: (a) the powder has a nystose content of 71 to 90 wt% (b) the powder contains 0.2 to 18.6 wt% gluconic acid relative to a total weight of nystose crystals contained in the powder and (c) the powder has a water content of 7-14 wt%. According to the present invention, there is also provided a method for producing a nystose crystal-containing powder of the present invention, comprising the steps of: (A) generating nystose by reacting sucrose with an enzyme solution containing ²-fructofuranosidase and glucose oxidase (B) converting glucose in the reaction mixture solution into gluconic acid by glucose oxidase (C) adjusting a gluconic acid content in the solution obtained by steps (A) and (B) to 0.1 to 20 wt% (D) obtaining nystose crystals from the solution obtained by step (C) and (E) adjusting a water content of the nystose crystals obtained by step (D).
