To implement an analysis of consumer behavior effectively, it is important to grasp customer interests in purchasing, and the reactions to sales promotion. So it is useful to analyze both ID-POS data and the data of customer's action log simultaneously, and it is needed that the log data is collected easily and precisely. In this paper, we propose indoor location estimation method based on received signal strength indicator between Bluetooth devices. In our experiments, we devise a layout of Bluetooth devices and algorithm of the estimation. Additionally, we make a benchmark instances to test our method, and we show that our method has good performance.