Studies concerning patient demands are mainly conducted at hospitals and pharmacies, whereas few surveys have been conducted on drug stores. The demand for drug stores is estimated to be increasing with growing needs for self-medication. Thus, conducting a customer survey at drug stores is thought to be valuable. The aim of the current study was to clarify the structure of customers’ demands for drug stores. The survey was conducted on 190 customers of 19 drug stores in Japan. The questionnaire consisted of 24 items using a 9-point Likert scale. The IBM SPSS Statistics version 23 (IBM Japan, Tokyo, Japan) and Amos version 5 (IBM Japan, Tokyo, Japan) were utilized to perform factor analysis. Gender did not influence the response to each question. Factor analysis showed that the structure of customers’ demands consisted of three factors: (1) an explanation about medicine, (2) staff’s manners, and (3) location of drug stores. Because fit indices suggested a good fit, this three-factor solution was adopted as the final factor structure. This study demonstrated the structure of customers’ demands for drug stores, with the potential for use in promotion of self-medication.