The purpose of this paper is to propose what a mathematics teacher education for Upper secondary level should be. In our country, research on teacher education has not been mainly focused on in the mathematics education research. Therefore only small numbers of research papers on this topic have been reported. On the other hand, mathematics teacher education has been taken up from the international point of view. However, the main target for mathematics teacher education is not upper secondary level, but lower secondary level and primary level.
In the first parts of the paper, the direction and approach of mathematics teacher education for new age was considered. In the middle parts of paper, we illustrate the difference in quality between Academic-oriented lesson study and Meritocratic-oriented lesson study. The quality is characterized by three parts: the viewpoint regarding subjects, the relation to researcher, and the position in the school system. In the last parts of paper, we consider to propose the method of curriculum development through Lesson Study. Mathematics teachers should be interested in three points for curriculum development: in the subject matter, in the learner, and in the learning object.
