Introduction: This research, aimed at determining the psychometric properties of the Diabetes Management Self – Efficacy Scale (DMSES) in type II diabetes patients. Materials and Methods: We Selected 112 patients with type II diabetes (according to diagnosis of profession), reffered to Alzahra hospital and asked them to complete the questions (for determining reliability). To study the concurrent validity of DMSES, 40 patients were asked to complete the General Self – Efficacy Inventory (GSES) and Diabetes Care Behavior Inventory. Results: Result Showed that all four subscales have significant and relatively high test-retest and internal reliability. The coefficients of concurrent validity were significant (0.81, 0.48), and results of the correlation matrix showed that the scale has good internal structure. Conclusion: Results of this research is similar to other versions of  DMSE in other languages, and the DMSES scale was shown to be a valid and reliable instrument and can be a common and cross-cultural instrument.