The success of rural development is closely related to agricultural development in an area. Agricultural extension officers play a very important role in determining the success of agricultural development in the village. The objectives of this study were 1) to analyze the perception of farmer groups on the role of agricultural extension officers in rural development in Sunggal District, Deli Serdang Regency, and 2) to analyze the influence of the agricultural extension agent's role on rural development in Sunggal District, Deli Serdang Regency and 3) to analyze efforts to increase the role of the agriculture extender in rural development in Sunggal District, Deli Serdang Regency. The method used in this research is descriptive quantitative. The population in this study were 45 respondents and all of them were used as samples (saturated samples), the sample was the head of the irrigated rice farmer group. The data collection method used in this study is a survey method. The analytical method used is descriptive analysis and multiple regression analysis. The results showed that the perception of farmer groups on the role of the agricultural extension officer in rural development was positive, and the influence of the role of the agricultural extension officer as a facilitator, innovator, motivator, dynamist and educator simultaneously had a significant effect on rural development in terms of income. Partially, the facilitator variable has a significant effect on rural development in terms of income. Meanwhile, the innovator, motivator, dynamist and educator variables have no significant effect on rural development. Efforts to increase the role of agricultural extension officer in rural development in Sunggal District, Deli Serdang Regency can run well and correctly if they are supported by professional extension workers, reliable extension institutions, and continuous flow of extension materials, a correct extension system and appropriate extension methods appropriate and polyvalent extension management. Keywords: agricultural extension officer, rural development .