Disclosed is a cellooligosaccharide composition comprising, as the main ingredient, at least one cellooligosaccharide selected from the group consisting of cellobiose, cellotriose, cellotetraose, cellopentaose and cellohexaose, which is in the powdery form having an average L/D value of 3.0 or lower, a bulk density of 0.80 g/mL or lower and an angle of repose of 60° or lower.本發明係提供一種纖維寡糖(cello-oligosaccharide)組合物，其係以含有纖維二糖及選自由纖維三糖、纖維四糖、纖維五糖、及纖維六糖所組成之群中之1種以上纖維寡糖作為主成分，且平均L/D為3.0以下、容積密度為0.80 g/mL以下、靜止角為60°以下之粉末。
