The present study examined national attitudes among Japanese citizens. A National Identity Scale was developed and administered to a non–student sample (n = 385) and an undergraduate sample (n = 586) in a metropolitan area of Japan. The results revealed aspects that are common (i.e., etic) to different nationalities and those that are indigenous (i.e., emic) to Japanese people. Factor analyses identified etic factors of patriotism (i.e., love of the homeland), nationalism (belief in superiority over other nations), and internationalism (preference for international cooperation and unity). Attachment to the ingroup and ethnocentrism were thus shown to be separate dimensions. Distinct from these factors, commitment to national heritage emerged as an emic component of Japanese national identity. The discriminant validity of these factors was demonstrated in differential relationships with other variables, such as ideological beliefs and amount of knowledge. Commitment to national heritage was associated with conservatism, whereas internationalism was related to liberal ideology, a high level of media exposure, and knowledge of international affairs. Implications for the study of intergroup and international relations are discussed.