The Author consider legal interest and the public interest prosecutor brings an action pursuant to art. 7, 57 and 189 Civil Procedure Code. She consider what is the legal interest and the public (social) prosecutor, the prosecutor heading the process that brings an action for self-determination and the related issue of demonstrating the existence of a legal interest, and the relationship between legal interest – as a prerequisite for substantive and the public interest – as a prerequisite for participation process prosecutor in civil proceedings.