PROBLEM TO BE SOLVED: To provide novel sealing liquid for an anodic oxidation film of aluminum alloy, which does not contain nickel salt, which is capable of imparting approximately the same level of corrosion resistivity and sealing performance such as sealing level as the case of using sealing liquid containing nickel salt, and furthermore performing sealing relatively at low temperature comparing to the case of performing nickel acetate sealing, and to provide a sealing method for anodic oxidation film of aluminum alloy.SOLUTION: Sealing liquid for an anodic oxidation film of aluminum alloy consists of aqueous solution containing ethanolamine compound and at least one type of anionic surfactant selected from the group consisting of sulfonate type anionic surfactant and sulfate ester salt type anionic surfactant. In a sealing method for an anodic oxidation film of aluminum alloy, an article having the anodic oxidation film of aluminum alloy is immersed in the sealing liquid.
