Purpose: The purpose of the study was to identify factors influencing physical activity among community-dwelling older adults withtype 2 diabetes. The study design was based on the Theory of Triadic Influence. Methods: A total of 242 older adults with type 2 diabetesparticipated in this study. Six variables related to physical activity in older adults, including self-efficacy, social normative belief,attitudes, intention, experience, and level of physical activity, were measured using reliable instruments. Data were analyzed usingdescriptive statistics, Pearson’s correlation analyses, and a path analysis. Results: The mean physical activity score was 104.2,range from zero to 381.21. The path analysis showed that self-efficacy had the greatest total effect on physical activity. Also, experiencehad direct and total effects on physical activity as well as mediated the paths of social normative beliefs to attitudes and intentionto physical activity. These factors accounted for 10% of the total variance, and the fit indices of the model satisfied the criteriaof fitness. Conclusion: The findings of the study reveal the important role of self-efficacy and past experience in physical activityin older adults with type 2 diabetes.