It was determined that the complexity and multifacetedness of «public interest» causes its various expression and characteristics, in particular: the satisfaction of public interest is laid at the basis of the activity of public authorities, or is even the goal of implementing the tasks (functions) of the executive authority; the goal to be achieved by the public administration; an integral component of administrative and legal relations; relations formed in the field of public administration are aimed at ensuring the public interest. This state of affairs emphasizes the inextricable interrelationship of the performance of the tasks assigned by law to public administration bodies (including the State Border Service of Ukraine), whose activities are aimed at satisfying public interests.
 It is emphasized that the concept of «public interest» is not sufficiently defined in regulatory and legal acts and legal doctrine. In particular, the definition of «public interest» in the Law of Ukraine «On Administrative Procedure» reveals the subject structure, but its substantive and quantitative aspect remains unclear.
 Taking into account the subject of the study, the position of scientists is supported, who do not focus on the quantitative composition of persons (significant or large number), whose interests are needed by satisfactory subjects of public administration, and it is emphasized that officials of the State Border Service of Ukraine as a subject of public administration should to satisfy any interests of individuals or legal entities, regardless of their number, if they (interests) by content and character are in the realm of the exercise of their public powers.
 It has been established that the public interest in the field of state border protection, the implementation of which is ensured by the State Border Service of Ukraine, is not only the safety, inviolability of the state border line and other related monitoring, preventive, preventive activities, but also the individual interests of private individuals, in particular regarding the crossing of the state border and the provision of information services (requests for public information, citizens' appeals, granting of permission to stay in the border zone, etc.), the provision of which activities can be defined as service.