Different countries around the world have different attitudes to the problem of public opinion. If we analyze these views, we can see that about 50% of the world's population believes that public opinion does not exist and can not exist, but the other 50% believe that it still exists. Of course, as the life of society demonstrates, public opinion exists in democracies and cannot exist in totalitarian countries where there is "one true opinion." Ukraine became a democratic country today, one of the European states, that has the rich ceremonies, traditions, habits, language, special culture, belief and desire of independence and social economic development, and yet political understanding. It is native desires of the Ukrainian people. The aim of the article are generalization of theoretical approaches in relation to a concept "public opinion" and attempt to analyze her influence on socio-political life of country. A few directions of research of public opinion were formulated in the modern world. The Ukrainian scientists try revaluation essence of public opinion, interpret it from positions of modern sociological knowledge, in fact at past tenses this theme was closed. Today the sociologists of Ukraine try to investigate the role of public opinion for an association, to show her value as social institution and to define ways and principles of her forming and functioning. Such known Ukrainian scientists worked in the field of public opinion and politics. Public opinion is the phenomenon historical. Social, economic, political, ideological his operating conditions change on the measure of development of civilization, human society, his functions become complicated, a role and status change in life of society. To Tom, taking into account general meaningfulness of public opinion simultaneously the looks of scientists changed to her function directly in the administrative department of society, political process. In the process of forming of public opinion certain intercommunications are distinguished between his transmitters. Interests of society on the whole cannot coincide with interests of separate task forces and even layers of population. Therefore for individuals, collectives, groups of population correct public opinion is formed not always, id east that would represent majority of task forces of population opinion. The process of forming of public opinion is multidimensional He is based on specific interests and on differences in knowledge, culture, being informed of people. Forming comes true by exchange opinions during conversations, consultative meeting, discussions, and spores. Thus, it is possible to assert that public opinion ‒ it the phenomenon of mass consciousness of people, she is formed and develops together with development of society, and development of society depends on rights freedoms of citizens, that create this society. And as citizens elect the organs of rule and enter to them, then they influence on socio-political life countries.