Abstract
Orokko Dialect has /ö/ as one of vowel phonemes. It corresponds to the halfclose outer-back rounded vowel [o]. The photograph shows the pronunciation of [o:]. At least some dialects of Tungus have probably a vowel corresponding to /ö/, like Orokko Dialect. The author emphasizes that, in the study of Tungus, it is important to describe the difference between such a vowel and other vowels.