A lactulose-containing powder composition is produced by preparing a raw
material liquid so that a lactulose content within a powder produced
following spray drying is 10 to 50% by weight, a protein content is 0.2
to 9.0 parts by weight per 1 part by weight of lactulose, and a chlorine
content is no more than 0.08 parts by weight per 1 part by weight of
protein, and subsequently subjecting this raw material liquid to spray
drying.