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Teacher leadership is one of the important components of school reform. Therefore, teacher leadership development needs to be done to improve teacher professionalism and teacher quality. This research shows how teacher leadership develops during learning activities. This research was conducted in junior high school about science subjects. This research is a case study that occurs in junior high schools in the development of teacher leadership while the following learning. Participants in Lesson Study activities were 36 teachers from a school in Sumedang District. The background of the teachers who take part in the program is not only natural science teachers. There are also social science teachers, linguistic teachers, art teachers, and sports teachers who take place in this lesson study program. This research shows that teachers can develop themselves, develop teams, and develop their school institutions during the program. The attitude of teacher leadership arises and develops starting from the planning phase, the do phase and the reflection phase. The teacher model looks capable of inspiring colleagues and students in the class. the teachers mental attitude to dare to take the risk of being a model teacher in lesson study activities is the key to the development of teacher leadership attitudes.