Authentic materials are one of common materials in teaching English. Most of teacher usually use them to be implemented into their classroom. One of the reasons of the teachers they use it in the classroom is in order to give the students example of the real use of English in social life. Other than authentic materials, the teachers also usually use textbook. It is because textbook gives much easier for the teachers to use it in the classroom and also for the students to studied at home. In implementing the authentic materials is not as easy as using textbook. The teachers need to be creative to select and modify the authentic materials to be able to be implemented. It is because the authentic materials are not produced for pedagogical purposes. So, in this study, the objectives of the researcher are to seek about the perception of using authentic materials in the classroom, the reasons of the teachers about the perception, and also the way of the teachers when implementing the authentic materials in the classroom. Regarding the objectives above, the qualitative research is appropriate to be conducted in this study. It is in order to get the deep data from the research subject. To get the data, this study uses interview and observation. By the interview, it gets the answer of all the research questions. And by the observation, it gets the supporting data from the interview.