The purpose of this study is, to empirically analyze the effect of extension of Quality concept and Quality Management on business performance, and to propose their necessities. And, to offer base manure enforcing our business international competitive power by inducing them to extend the Concept of Quality and to adopt Quality Management. By analyses of the questionnaires, the following consequences are confirmed. First, the company which have the more extended quality concept, is more developed and closer to QM stage(i. e. the most developed stage of Quality Management). Second, the more extended quality concept the company has and the more advanced the company is in the Quality Management, the more positive influence can be made on the improvement of the business performance. Third, the added value per employee is attributed to the extension of quality concept rather than the development stages of Quality Management.