A company's atmosphere and sales performance are both important factors of an organization. The relationship between salesperson's workplace friendship and sales performance in service industry remains unclear. This study aimed to find out the relationship between salesperson's workplace friendship and sales performance. Survey of banks and department stores of 130 salespersons found that the positive effect of salesperson's workplace friendship on sales performance. Executive / non-executive moderated the relationship between workplace friendship and sales performance. That relationship between workplace friendship and sales performance of executives were significantly stronger than that of non-executives. The study also made recommendations for future research and practice practitioners reference.