Regional differences (based on the number of resident Japanese-Brazilians in the region) and differences in schools (Japanese public or private Brazilian schools) on the career decisions of Japanese-Brazilian parents and their children, as well as the relationship between their career decisions and school adjustment were investigated from the perspective of acculturation. A questionnaire was administered in a public school in A prefecture with a few Brazilian residents; public school in B prefecture with many Brazilian residents; and a Brazilian school in B prefecture. We collected 127 completed questionnaires from Brazilian children and 120 from their parents. The results indicated the following findings. The Brazilian school had more children who planed to return to Brazil after graduating from junior high school compared to the public school. Moreover, the public school in B prefecture had more children who planed to stay in Japan. The public school in A prefecture had many children who planed to return to Brazil, and who had not decided their future plans. The relationship between career decisions and school adjustment indicated that children who had not decided on their future career were less adjusted to school. It was possible that the vague plans of parents to immigrate made it more difficult for children to make appropriate career decisions. Problems and limitations of using the questionnaire method for studying Japanese- Brazilians living in Japan were also discussed.