Abstract
The purpose of this study is to elucidate Japanese high school language teachers' structures of practical knowledge provided the foundation for teachers' questions. In this study, the author investigated the excellence of proficient teacher's structure and universality by analyzing narratives of a proficient teacher and a novice teacher. The author found that the difference of the structures of practical knowledge between proficient teacher and novice teacher is relationship of elements constructed their practical knowledge. In the case of proficient teacher, the elements of practical knowledge, that is to say "reading target", "vision of learner", "process of generating teacher's question", are closely connected.