This study aims to reiterate the results and challenges of creating mock lessons as a group. The object of the study was the process of creating a mock lessons as a group recorded by the students and their impressions of the process in a class that the author was in charge of. The group consisted of five members, whose roles were representative, recorder, instructional planner, pre-service teacher, and teacher of the mock lesson. Before the mock lesson another teacher gave a lesson as a rehearsal, which was the first time this project was conducted. The first was that we were able to study the lesson with an awareness of the actual situation of the students. Second, it provided an opportunity for the students to form a new view of the class. On the other hand, the issue is that each student has his or her own individual view of the class. It is one of the results that the students were able to update their own views of teaching, which were based on their own experiences in the past, in the course of creating classes in groups. On the other hand, the problem is that it is difficult to create classes that make the most of the individuality of each student. This did not lead to the creation of classes that made the most of each student's strengths.