As global environmental issues have become aggravated, “Eco” become one of competitive advantages in the business because of increasing consumers' environmental consciousness. However, it is difficult to lead eco-business to the success in both of environmental and economic aspects because of three features of eco-business; external diseconomies, unrecognition of environmental value in the market, requirement for restructuring of business model. For solving this problem, it is effective to support finding out Eco-business ideas. The purpose of this study is to propose the methodology that supports generation of eco-business ideas. This paper proposes the methodology, which has 8 steps, such as generation, settling, evaluation, through the investigation of eco-business and makes sure of its effectiveness through workshop.