In the past few years, there have been several instances of illicit pharmaceutical manufacturing in Japan, and there is a growing awareness of the importance of corporate compliance and pharmaceutical manufacturing and quality controls. One cause of illicit manufacturing is the inadequate development of quality culture. This study focuses on the degree of quality culture development in Japanese pharmaceutical companies manufacturing generic drugs. Since no evaluation index for Japan can visualize the degree of quality culture development in each company, this study sought to establish this index to utilize it as a tool for evaluating the degree of quality culture development that would enable each company to continuously monitor and improve its own. We conducted a questionnaire survey among Japan Generic Medicines Association members to evaluate the degree of their quality culture development. The questionnaire contained 28 questions in five evaluation categories. Potential indicators of quality culture development included ″Employee growth and satisfaction″; ″Management commitment″; ″Improvement activities″; ″Communication ″; and ″Environment, health, and safety.″ We obtained 294 responses from 37 Marketing Authorization Holder (MAH) and 61 manufacturing sites. Respondents were classified by roles of management, manager, and non-manager. The results confirmed the current status of quality culture development efforts, showing that important messages such as the corporate philosophy as communicated by the management is well known, awareness of quality culture development level differs by role, and appropriate resources are not adequately allocated to employees or facilities. Based on the results, using the index of quality culture development helped to make relative comparisons, and visualize the areas to be addressed for quality culture development. This study established and visualized the index for the degree of quality culture development in domestic generic drug manufacturing companies and hopes this indicator becomes a useful tool for evaluating a company's quality culture development level.