The present study investigated the interaction effect of time beliefs and interests in learning on the academic performance among Japanese junior high school students. We conducted a secondary analysis of a social science study whose data was provided by the Social Science Japan Data Archive. A total of 1672 junior high school students took an achievement test and responded to questionnaires that included items about time beliefs and interest in learning. The results of hierarchical multiple regression analysis showed that hedonists’ academic performance was worse than ascetics’. However, the results also showed that interests in learning had a positive influence on academic performance, and this effect was stronger for hedonists than for ascetics. These results indicate additional positive aspects of concentrating on the present time in the field of learning, and these findings may be helpful for students who do not have a future perspective.