The European Union represents a peculiar type of polity. It is not a nation-state and not a federation as well as not an international organisation. The European integration process went outside the economic dimension and not it is possible to identify a clear distinctive body of constitutional law and public law of the European Union. Recent work of the European Convention prepared the draft of the constitutional treaty at present in the process of ratification. The aim of the course is to cover in depth the functional constituionalism of the European Union. Also its public law and external relations will be analysed and discussed.