Purpose: The aim of this study was to explain the structural relationship between psychological capital and mental toughness with happiness in students.
Materials and Methods: The cross-sectional research method is correlational. For this purpose, among the students of Tehran Azad University, Research Sciences Branch in the academic year 2020-2021, 380 people were randomly selected. In this study, Oxford tools of happiness, psychological capital and mental toughness were used, all of which had acceptable validity and reliability. SPSS-V23 and Amos-V8.8 software were used to analyze the data. Structural equation modeling was also used to answer the research hypotheses. The results of Pearson correlation test showed that there is a significant positive relationship between the components of psychological capital (resilience, optimism, hope and self-efficacy), components of mental toughness (commitment, struggle, restraint and trust) and students' happiness.
Findings: The results of modeling test showed that the happiness model fits based on psychological capital and mental toughness. Based on the results of psychological capital modeling test and mental toughness, they are able to explain 52% of the variance of students' happiness.
Conclusion: The findings of this study showed that in order to increase the level of happiness of students, based on positive psychology and personality traits such as psychological capital and mental toughness, effective measures can be taken to enhance happiness and quality of life of students and people in society. Given the conditions imposed by the Corona epidemic, this is necessary.