This paper proposes a quantitative approach with statistical techniques for identifying the relationship between Internal Corporate Social Responsibility (ICSR) and Affective Commitment (AC) and clarifying the mediating effects of job satisfaction of employee. Five factors of ICSR including human rights, training and education, health and safety, work-life balance, and workplace diversity were examined. The major method in this paper is based on the quantitative approach, in which statistical techniques including Factor Analysis, Multiple Regression, and Path Analyses were performed. The unit of analysis was at individual level with the sample size of 233 employees who are working in different departments. The findings of this study showed that the higher levels of human rights, health and safety, job satisfaction and work-life balance employees were perceived at the higher level of AC. Based on the results of the path analysis, this study argued that to achieve high employee AC, employers should reach higher level of employee job satisfaction and improve human rights, health and safety and work-life balance. Although there were limitations, this study is expected to highlight several implications for small and medium companies in building ICSR.