An object of the present invention is to provide a compound excellent in antibacterial properties and a compound excellent in enhancing the antibacterial properties of other antibacterial agents. SOLUTION: An antimicrobial sugar derivative or a salt thereof, in which a monosaccharide is linked by a glycosidic linkage in a linear or cyclic form and represented by the chemical formula (1) or (2) below. Here, R1 represents a structure containing an amino group. n is an integer of 3 or more. In addition, a sugar derivative having an antibacterial activity enhancing action or a salt thereof, which is represented by the chemical formula (5) or (6) below, in which monosaccharides are linked in a linear or cyclic manner via glycosidic bonds. Here, R3 represents a structure containing an amino group. R4 is an acetyl group or a propanoyl group. n is an integer of 3 or more. [Chem. 1] [Chem. 3] [Choice] None【課題】抗菌性に優れた化合物を提供するとともに、他の抗菌剤の抗菌性を増強することに優れた化合物を提供する。【解決手段】下記の（１）または（２）の化学式で示される、単糖がグリコシド結合で鎖状又は環状に連結した抗菌作用のある糖誘導体又はその塩。ここで、Ｒ１はアミノ基を含む構造を示す。ｎは３以上の整数を示す。また、下記の（５）または（６）の化学式で示される、単糖がグリコシド結合で鎖状又は環状に連結した抗菌活性増強作用のある糖誘導体又はその塩。ここで、Ｒ３はアミノ基を含む構造を示す。Ｒ４はアセチル基又はプロパノイル基である。ｎは３以上の整数を示す。【化１】【化３】【選択図】なし
