The purpose of this study was to formulate a model of institutional development of corn agribusiness in Muna Regency. This research was conducted in Muna Regency in January 2017 until May 2018. The data analysis used is qualitative descriptive analysis. The results showed that the corn farmer group had not yet played a role in conducting collective learning, collaboration and production activities, so that the farmers walked individually in corn agribusiness activities. The combined institutions of farmer groups, cooperative institutions, and community economic institutions have not played a maximum role as maize financing institutions, processing and marketing of maize, so it has not guaranteed maize farmers to increase their income continuously. Extension agencies have not been instrumental in strengthening the corn agribusiness institutions and adoption of agribusiness technology of corn to corn farmers. Integrated corn agribusiness institutional model between corn farmer group, combination of maize farmer group, community economic institution, cooperative, and village-owned enterprise supported by extension institution, research and development institution/university, banking institution, production facility institution, processing and marketing efforts, can increase the income of corn farmers in a sustainable manner in Muna Regency.