The purpose of this article was using structural equation modeling to explore the relationship between social security and happiness with the mediating role of psychological capital. The method of the present research was descriptive-correlational. The statistical population consisted of all 15-65 year-old people in Ahwaz, 4th district. Using Kerjesi and Morgan table, 404 people were selected by random cluster sampling. Research data were collected using Social Security, Psychological Capital and Oxford Happiness Questionnaires. Data analysis in this study was performed using structural equation modeling path analysis method. The results of the model’s compilation phase showed that fitting indicators of the model are appropriate. According to this model, the indirect effect of social security on social happiness was significant by means of psychological capital (β = 0.25) at the significance level of p <0.05.The results also showed that social security on social happiness (β = 0.46, p <0.01), psychological capital on social happiness (β = 0.32, p <0.05) and social security on psychological capital (p = 0.27, p <0.05) had a direct effect. In sum, the results showed that social security through the influence of psychological capital, as an influential mediator, can affect social happiness.
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