This study aims to know Indonesian teachers' perception of the implementation of lesson study. A case study was used as the design of this study with six teachers of Islamic Elementary School in Semarang, Indonesia, were chosen by using purposive sampling. A questionnaire with the Likert Scale of 1 to 4 was distributed to the respondents after implementing lesson study. A deep interview was also given to the teachers to explore their awareness of pedagogical knowledge. The quantitative data were analyzed statistically and they were used to support the qualitative data got from the interview. The result showed that the teachers had a new perspective in the pedagogical context in which a preparation of teaching could be prepared well by formulating and designing the lesson collaboratively with the other teachers to achieve the learning goal. Through the intensive collaboration with the teachers, they were more aware to create the effective and meaningful teaching to the students. They knew how to teach the students through the instructional strategies designed.