Disclosed are (1) a glycolipid derivative in which a nitrogen atom-containing hydrophobic group is introduced into an anomer carbon atom of a reducing end group of an oligosaccharide having a saccharide polymerization degree of 5 to 30, and (2) a phospholipid vesicle stabilizer comprising a glycolipid derivative in which a nitrogen atom-containing hydrophobic group is introduced into an anomer carbon atom of a reducing end group of an oligosaccharide having a saccharide polymerization degree of 2 to 30.
