PROBLEM TO BE SOLVED: To provide an improver for specifically improving concentration of a silver ion eluted from a silver carrier for obtaining antibacterial activity of the silver carrier such as silver-carrying zeolite, an antibacterial composition containing the improver and a bath agent containing the antibacterial composition and excellent in storage stability.SOLUTION: An elution of a silver ion from a silver carrier is specifically improved by using a silver elution improver containing solium sulphate as an active ingredient.SELECTED DRAWING: None