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Infrared (IR) absorption and ESR spectra of iron and chromium impurities were studied in CuInS2 crystals. Both iron in its divalent and trivalent valence states and chromium in its divalent state were observed. The charged states of these ions showed a drastic change in accordance with the Fermi level movement in the band gap introduced by vacuum- and sulfur vapor-annealing. The g-values of these divalent ions determined from ESR (g ł=2.20 in Fe2+ and <g>=1.935 in Cr2+) were in good agreement with those estimated theoretically using approximate values of crystal-field parameters (D q∼350 cm-1 in Fe2+ and D q∼570 cm-1 in Cr2+) deduced from optical absorption spectra.