The purpose of this study is to describe the teacher's competence as a teacher at the school. This study uses quantitative and qualitative descriptive approach. A quantitative approach used to collect data in the form of figures analyzed by describing or explaining through tables and percentages. A qualitative approach was used to describe or depict the phenomenon exists then do conclusion. Results from the study showed that the pedagogic competence, professional competence, personal competence and social competence of teachers of mathematics not optimally achieved, this can be seen on the criteria of professionalism of teachers. In other words, a mathematics teacher at the school still needs to follow the training / competence development training of teachers so that the quality of education and the quality of its teachers will increase. This type of data obtained through test pedagogical competence and professional competence, filling questionnaires and direct observations of mathematics teachers and principals. Test results: (1) pedagogical showed that three teachers from high category (excellent) and 2 teachers categorized as being (fairly good); (2) the professional competence of the teacher shows two high category (excellent) and 3 teachers were categorized (pretty good). While the results of the questionnaire from: (1) pedagogic competence gained 3 people categorized excellent teacher and two teachers categorized as good; (2) Professional competence gained 2 categorized excellent teachers, 2 teachers categorized as good and 1 teacher categorized quite good; (3) Competence Personality category 3 good teacher, 1 teacher categorized quite good and 1 teacher categorized as poor; (4) Social competence gained 3 people categorized good teacher, two teachers categorized quite good. From the results of tests, questionnaires and observations can be concluded that the three (3) professors included in the criteria profesionalis teacher, 1 teacher included in the criteria is quite professional and 1 teacher included in the criteria unprofessional