The absorption spectra of PbI2 at low temperature were examined after the method of Nikitine. For the band at 500 mµ, the existence of the hydrogen-like series was confirmed under the assumption that the band was composed of several components of Gaussian type, represented by the formula υ = 20, 853 − 1, 150/n2 cm−1 [20 °K]. As for the shape of each component of the band, the Gaussian form was preferable than the Lorentzian one, though the latter was expected from Toyozawa's theory. From the temperature-dependence of the band, it was concluded that (i) the rate of shift of the absorption maximum towards the shorter wavelength with the lowering of temperature is ca. 1. 5 · 10−4 ev/°K and (ii) the half value width of the band is ca. 0.02 ev, which is not sensitive to the temperature.