Chromium hydroxide of the invention has an average particle size D determined from a scanning electron micrograph of 40 to 200 nm and a degree of agglomeration of 10 and more and less than 70, the degree of agglomeration being defined to be a ratio of a volume average particle size D50 determined with a particle size analyzer to the average particle size D, D50/D. The chromium hydroxide is suitably obtained by adding an aqueous solution containing trivalent chromium to an aqueous solution of an inorganic alkali at a reaction temperature of 0° C. or higher and lower than 50° C. The inorganic alkali is preferably an alkali metal hydroxide.