PROBLEM TO BE SOLVED: To provide a cellulose aerogel that gives excellent texture and appearance when used as a restored hydrogel.SOLUTION: The method of manufacturing the cellulose aerogel includes: an osmosing step of immersing a cellulose hydrogel including a cellulose fiber in 0.001-4 mass% of disaccharide solution to osmose the disaccharide in the cellulose hydrogel and a drying step of drying the cellulose hydrogel obtained through the osmosing step.