The purpose of this study is to grasp the self-presentation strategies of elementary school teachers using Instagram and identify the professional self that elementary school teachers want to present in SNS. For this purpose, in-depth interviews were conducted with seven elementary school teachers using Instagram. The experiences of elementary school teachers’ self-presentation through Instagram were divided into positive experiences such as communication and empathy with teachers, cheering from students and parents, and negative experiences such as criticism that they were idle jobs, they were revealing their jobs in too much detail, and the disclosure of personal information. Elementary school teachers build self-presentation strategies in a way that strengthens ‘teacher-like teacher’ based on their own experiences. ‘Teacher-like teacher’ means a teacher who has a ‘true, faithful, always positive and perfect’ attitude in every life. The teachers took a passive self-presentation strategy due to repeated surveillance through the process of self-monitoring, group monitoring, and other teachers’ monitoring so that self-presentation on SNS would include the image of a “teacher-like teacher.” This is an attitude caused by a strong public self-consciousness that considers the entire group of teachers rather than individual teachers, and is based on the hierarchical and conservative culture of the teacher society. Teachers strongly criticize the ostentatious self-presentation that deviates from the ‘teacher-like teacher’ and justify the group monitoring. In the end, elementary school teachers, based on the characteristics of ‘collective narcissism’, reacted sensitively to the critical and negative external gaze and took a self-presentation strategy to positively shape the image of the teacher group as a whole. This is a strategy to protect the teacher group from external criticism, and the individual teacher should use SNS according to the teacher s self-expression strategy as one of the members of the teacher group rather than free self-expression.