Economic Development in Bihar has been a major challenge faced by the city dwellers, in general, and the economic development in India remains high at over 25 percent. There is an increasing flow of co-operative movement in the economic development of Bihar. They are the very foundation stone of the co-operative institutions in India. Different bodies of agricultural credit co-operatives are described in this book in detail. The main objective of the book is to provide brief information about long term financial planning through five years plan. According to RBI a co-operative marketing society is an association of cultivators. The purpose is to help them in the terms of market their produce more profitably than possible though the private trade. The above facts have been discussed in this book in three sections. Section I deals with the concept of role of apex co-operative bank in economic development in Bihar, Section II examines various agriculture finance during various five years plan with special reference to Bihar, Section III deals with conclusion, finding and recommendations dealing with economic development.