A replenisher used to replenish metallic material surface treating solution with zirconium ion, the metallic material surface treating solution containing zirconium ion and fluorine ion and being used to form a chemical conversion coating containing zirconium on/over a metallic material through chemical conversion treatment and/or electrolysis treatment, the replenisher comprising: a fluorine-free zirconium compound containing at least one selected from a group consisting of zirconium basic carbonate, zirconium carbonate, zirconium hydroxide and ammonium zirconium carbonate; a fluorine-containing compound containing at least one selected from the group consisting of hydrofluoric acid, a salt of hydrofluoric acid, hexafluorozirconic acid and a salt of hexafluorozirconic acid; and an acid component containing at least one selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid and acetic acid, wherein following relationships to are satisfied: a ratio (M AC /M F) of a total molar quantity (M AC) of anions derived from the acid component with respect to a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound is 0.35 or more and less than 2.00; a total concentration (g/L) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 25 or higher; and a ratio (M F /M Zr) of a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound with respect to a total molar quantity (M Zr) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 2.00 or more and less than 6.00. a fluorine-free zirconium compound containing at least one selected from a group consisting of zirconium basic carbonate, zirconium carbonate, zirconium hydroxide and ammonium zirconium carbonate; a fluorine-containing compound containing at least one selected from the group consisting of hydrofluoric acid, a salt of hydrofluoric acid, hexafluorozirconic acid and a salt of hexafluorozirconic acid; and an acid component containing at least one selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid and acetic acid, wherein following relationships to are satisfied: a ratio (M AC /M F) of a total molar quantity (M AC) of anions derived from the acid component with respect to a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound is 0.35 or more and less than 2.00; a total concentration (g/L) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 25 or higher; and a ratio (M F /M Zr) of a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound with respect to a total molar quantity (M Zr) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 2.00 or more and less than 6.00. a ratio (M AC /M F) of a total molar quantity (M AC) of anions derived from the acid component with respect to a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound is 0.35 or more and less than 2.00; a total concentration (g/L) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 25 or higher; and a ratio (M F /M Zr) of a total molar quantity (M F) of fluorine ion derived from the fluorine-containing compound with respect to a total molar quantity (M Zr) of zirconium ion derived from the fluorine-free zirconium compound and the fluorine-containing compound is 2.00 or more and less than 6.00.