This research is conducted to study about demographic and marketing mix factor influences on Pattaya people’s decisions making in purchasing lunch box delivery service with the following objectives. First, is to analyze the influence and to rank the importance of each demographic and marketing mix factor. Second is to provide recommendations for lunch box delivery businesses owners and for further studies or researchers. The main research instrument is questionnaire; the target group is 400 people living in Pattaya, who have experience purchasing lunch box delivery service. The data collected are further transferred to statistical program to analyze to find conclusions for this study.