This study attempts to investigate the actual situation of the secondary school mathematics teacher's lesson, based on the report of the school inspector of the Ministry of Education before the Second World War. Then, the following points became clear by their reports. First, many middle school teachers only explained a textbook faithfully and taught them logically and strictly. Because, they had to let students pass the entrance examination of advanced schools. In this paper, the middle school indicates a secondary school for boys and gives them ordinary education. Next, many middle school teachers did not teach the ABC of geometry with making a geometrical model and so on and did not teach uniting each branch of mathematics. In addition, they did not try to use educational instruments actively. On the other hand, some of girls' high school teachers instructed girls in arithmetic, algebra and geometry according to the Perry Movement. Moreover, many mathematics teachers weren't good at dialoguing with students in the lesson and at making students active mathematically, too. Finally, the curriculum of the middle school was revised in 1931 and at the law the mathematics teacher came to be able to teach each branch of mathematics synthetically. But many of them taught with former style in according to the unchanged entrance examination.
