Introduction: Ageing of population and protection of mental health in old age are becoming a major societal concern. Older adults are more likely to experience events that effect their mental health and weaken it. Therefore, consideration of the factors related to mental health of this group is necessary. So the purpose of this study was to study structural and simultaneous relationship of basic psychological needs and subjective well-being with mental health between older adults. Method:The research method was correlation. Among the elderly men and women over the and Psychological health (α=0/66) scales were used to collect date. The obtained data were analyzed using Pearson Correlation Coefficient (correlation matrix) and path analysis model using SPSS23and Liserl 8.5. Results:The results showed a significant relationship between basic psychological needs: autonom (p<0.01،r=0.78), competence (p<0.01،r=0/69), relatedness (p<0.01،r=0/75) with psychological health.and too significant relationship between cognitive well-being (p<0.01، r=0/49), emotional Well-being (p<0.01، r=0/73) and social well-being (p<0.01،r=0/67) with psychological health. Conclusion:Basic psychological needs and subjective well-being are important in improving the psychological health of older adults. Providing these needs will strengthen their subjective wellbeing and ultimately lead to better mental health.