Provided are: zinc chloride hydroxide that is useful as a pharmaceutical ingredient, has excellent zinc ion sustained-releasability when used as a pharmaceutical agent, and exhibits excellent stability as a pharmaceutical ingredient; and a production method therefor. The present invention pertains to zinc chloride hydroxide that can be used as a pharmaceutical ingredient, that has excellent zinc ion sustained-releasability, that comprises at least one member selected from the group consisting of zinc chloride, zinc hydroxide, and zinc oxide, and that, after an elution test is performed on a zinc chloride hydroxide hydrate containing simonkolleite by an agitation method, shows a Zn2+ ion elution per surface area of 0.25-100 [mu]g/m2 and a pH of not lower than 7.0 but lower than 8.3.