In this research paper, the objective is to highlight the degree of contribution of the agricultural sector in the region of Monastir to Economic growth of our country: "Tunisia". We limit ourselves to the study of regional development of agriculture in this region. This is to see the impact of this sector stage of development on economic growth. The question that concerns us is this: Is agriculture as an economic activity is involved in a huge way in the growth of the country? Or there are other more important areas in the region that are the core of economic development. Several hypotheses resulting which we quote which states that agriculture in the region and because of the recorded fluctuations had a negative impact on the country's economic growth and participates in a less efficient way, its role is less important comparison with other operative sectors in the region (manufacturing and non-manufacturing industries, Tourism, Services,...etc.). Several theoretical and empirical studies have shown that agriculture contributes an effective way to growth. Empirically, based on the time series, we will determine the contribution of the agricultural sector development and fisheries beyond fifteen years on growth and the country's economic development. Econometric results we found, it was found that agriculture contributed less efficiently to economic growth compared with other countries more competitive sectors and have considerable share in GDP and contribute more effectively to the economic development of Tunisia.