Tourism is multidimensional phenomenon which are a form of activity, recreation form and industry of national economy at the same time. Versatility of tourism puts forward an assessment of comprehensive influence of tourism in number of the main tasks of scientific research. In this connection, in articles interrelations of an economic, social, humanitarian, ecological, political role of tourism in modern society are defined. Separately, within an economic role of tourism, the forecast of dynamics of the world income of the tourist industry testifying to a sustainable development of the studied industry is submitted. Also in article classification of functions of tourism is made. As a sign of classification the purposes of a sustainable dev...