The concrete market is a gathering place for buyers and sellers to trade goods that are there. Based on preliminary studies indicated there are some traders who make a deviation in business practices in terms of Islamic business ethics principles. The formulation of this research is about how the application of Islamic business ethics principles to traders in traditional markets Pancasila Tasikmalaya. The purpose of this study is to find out how the application of Islamic business markets Pancasila Tasikmalaya. The research method using the descriptive method of the qualitative. The data source in this study, namely the primary data is interviewed to the relevant parties is traders, buyers and managers of traditional markets Pancasila. While the secondary data are data obtained through reports on traders and PD. Profiles the traditional market of Pancasila. By using data collection techniques in the form of observation, interview, and documentation. While the data analysis techniques using analytical techniques developed by Miles and Huberman, with its stages: data reduction, display data, and conclusion drawing/ verification. Based on the results obtained from traders, buyers, and managers of traditional markets Pancasila shows that the principles of Islamic business ethics basically traders have applied in the activity of buying and selling. However, there are some deviations committed by traders in buying and selling such as, there are still those who neglect prayers, cheating on scales, selling goods below market prices due to tight market prices, less honest traders do not pay the debt to the supplier, doing savings and loan to conventional bank, unclear expiration limits, and there are still processed food products that add formalin and borax.