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Self-efficacy has an important role for the development of the competency of prospective teacher students and basically already exists in every student. To find out the initial description of this self-efficacy, instruments need to be developed that can measure aspects related to the self-efficacy. The instrument used to measure student self-efficacy was in the form of a questionnaire developed based on the framework model of Riggs & Knochs (1990) and Bleicher (2004). The instrument validation process was carried out through qualitative and quantitative analysis. Qualitative analysis of items was carried out through a study by two linguists. Furthermore, item analysis was carried out quantitatively to determine the level of validity and reliability of the item. The results of the study showed that all items in the self-efficacy questionnaire were valid and reliable so that it can be concluded that the self-efficacy instruments are valid and feasible.