In the 1980s and 90s in psychology, many cross-cultural comparisons were made concerning individualism and collectivism with questionnaires and experiments. The largest number of them compared “collectivistic” Japanese with “individualistic” Americans. This chapter reviewed 48 such empirical comparisons and found that Japanese were no different from Americans in the degree of collectivism. Both questionnaire studies and experimental studies showed essentially the same pattern of results. Many researchers who believed in “Japanese collectivism” suspected flaws in those empirical studies. However, none of the suspected flaws was consistent with empirical evidence. For example, although it was suspected that “Japanese collectivism” was not supported because college students provided data as participants, the studies with non-student adults did not support this common view either. It is thus unquestionable that as a whole the empirical studies disproved the reality of “Japanese collectivism.”