The issue of Grande Comore diaspora is closely linked to the need to raise money for the big wedding, necessary step for the recognition of the individual in his society. The research proposes to approach the topic by following the itinerary of the first comorian migrants, the famous navigators in the Messageries Maritimes company, from Madagascar to France in the forties, then show the conditions of installation in the city of Marseille, and then analyze their contribution to the economic and social development of their country of origin. The presence of Grand Comorians in Marseille which began in the late forties, has intensified over the years. They became, over three decades, the largest black african community in Marseille and are emerging slowly with their identity and particularisms. Strongly attached to their island , Grande Comore diaspora has become an indispensable actor thanks to the financial and material contribution it brings today for the development of the island(25% GDP, more important than foreign aid to development). But the specter of a deep crisis threatens the Comoros: nothing garantees the continuity of transfers by new generations more concerned with their integration in France and less affected by village solidarity.