<;P>;PROBLEM TO BE SOLVED: To provide a gel antibacterial agent including an aqueous solvent obtained by using a single electrolyte compound. <;P>;SOLUTION: The gel antibacterial agent includes a compound expressed by formula (1) and an aqueous solvent. The compound is a mixture of oligomers having repeating units. In the formula, n represents a degree of polymerization in the range of 2-30 in integer. <;P>;COPYRIGHT: (C)2010,JPO&INPIT