[Problem] Provided are: a compound having excellent antimicrobial activity, and a compound having action for enhancing the antimicrobial activity of another antimicrobial agent.[Solution] Disclosed is a saccharide derivative represented by Chemical Formula (1) or (2), or a salt thereof. This compound includes units of a monosaccharide linked to each other in a chainlike or cyclic manner through glycosidic bonding and has antimicrobial action. In the formulae, R1 represents an amino-containing structure； and n represents an integer of 3 or more. Also disclosed is a saccharide derivative represented by Chemical Formula (5) or (6), or a salt thereof. This compound includes units of a monosaccharide linked to each other in a chainlike or cyclic manner through glycosidic bonding and has antimicrobial activity enhancing action. In the formulae, R3 represents an amino-containing structure； R4 is selected from acetyl and propanoyl； and n represents an integer of 3 or more.
