Set of economic, legal and organizational actions in the field of the currency circulation and monetary relations performed by the states, Central Banks and the international financial bodies, one of the main segments of economic policy of the state or group (union) of the states. Integration in the field of implementation of monetary and credit and monetarist policies has the historical features and also the different directions caused by the nature and the maintenance of the public ratios not only making this policy but also which are object of her influence. That is the European integration can be considered as integration of settlement payment systems, bank integration, financial integration and, naturally, currency integration. Each of these directions has the history and modern manifestations. And, undoubtedly, the Economic and currency union which defines specifics of implementation of monetary and credit and monetarist policies of the European Union became a wreath of the European integration in the specified directions. The European economic currency system is the regional currency system accepted by a number of the countries entering the European Union. The purpose of the European currency system consists in forming currency the relation and currency exchange, simplification of the economic relations between the countries, stimulation of integration of their economies, to contribution of stabilization of currencies. The eurozone the currency union integrating 18 countries of the European Union which official currency is euro. These states have the right to issue the coins and banknotes nominated in euro. European Central Bank is responsible for monetary policy of the countries of the eurozone.