In this study, factors affecting pupils' learning motivation were identified and the discrepancies between pupils' perceptions to the effect of the factors and those of teachers' were examined. Elementary school pupils' motivation was accelerated when they themselves felt positive about their work, or when their teachers showed positive behavior toeard them, but impeded when any negative judgment or behavior was shown from other persons, or when feeling bored or tired. At the junior high school level, students' motivation was enhanced by their own sense of positiveness and by their teachers' positive attitude toward them as well as by their friendly relations with their fellow students, but impeded by negative judgment or attitude from their teachers or other persons. Concerning the discrepancies of perceptions, both elementary school and junior high school teachers have estimated those factors in acceleration as "accelerating" much more than pupils or students have done. Concerning factors in impediment, elementary school teachers were seen to perceive these factors as more "impeding" than did junior high school teachers.