The main goal of this research is to study the effects of social capital dimensions on sustainable entrepreneurship in small and medium-sized companies located in Kermanshah. From the point of view of the data collection method, this research is among the descriptive and survey researches, and in terms of the purpose, it is practical. The statistical population of the research consisted of 180 managers of companies located in Faraman Industrial Town, Kermanshah. The standard questionnaire of social capital and sustainable entrepreneurship was used to collect data. The validity of the questionnaires was verified by professors and Cronbach's alpha and confirmatory factor analysis were used to measure the validity of the questionnaire. From the distributed questionnaires, 100 reports were returned and analyzed using the structural equation model and Amos software. The results obtained from the research confirmed the conceptual model of the research. The findings showed that the dimensions of social capital (structural, cognitive and relational) have a positive and significant effect on sustainable entrepreneurship. And in examining which dimensions of social capital have the greatest impact on the sustainable development of entrepreneurship. It was found that among the dimensions of social capital, the structural dimension has the greatest impact on the development of sustainable entrepreneurship, followed by the cognitive dimension, and the relational dimension has the least impact on the development of sustainable entrepreneurship.