A 24-item scale of cosmopolitanism was developed in which subjects were asked to indicate the degree of agreement or disagreement with each statement on its five-point scale. Scales were administered to 107 Japanese undergraduates including 60 female students and 26 female students at a school of nursing. Factor analysis of their responses produced four factors and they could explain over 80 percent of the total variance. The factors were "low ethnic superiority", "orietation to cross-cultural experiences", "awareness of global communities being bounded together by common fate" and "awareness of needlessness of the nation". Determinants of cosmopolitanism and its four factor scores were investigated including sex and various experiences of cross-cultural contact. According to the results, four variables contributed to the total cosmopolitanism score in a relatively greater degree. Those who had higher cosmopolitanism scores were female and studying a foreign language in addition to their studies in foreign language classes, wached TV programs of overseas affairs more often or had a book or two which describe cultures and life of foreign countries.