The present invention provides novel glycopeptides antibiotic derivatives. These glycopeptide antibiotic derivatives are characterized in that a sugar residue (I) represented by the formula: (wherein n is an integer of 1 to 5； Sugs are each independently a monosaccharide, (Sug)n is a divalent sugar residue formed by binding of same or different 1 to 5 monosaccharides； R A1 is optionally substituted lower alkyl, optionally substituted lower alkenyl, or optionally substituted cycloalkyl； and R E is OH or NHAc (Ac is acetyl)) is bound to an aromatic ring of the fourth amino acid residue in the glycopeptide skeleton. These derivatives have antibacterial activity against vancomycin-resistant bacteria.
