The article covers the question of the enforcement of acts of “soft” law — unformal sources of regulation of public relations. It is pointed in the article, that though acts of “soft” law are not the sources of law in traditional understanding, such acts are important practical regulators of private-law relations. The author gives the common characteristic of acts of “soft” law, makes comparative analyses with legal acts. Although the most attention in the article is paid to the legal effect of the enforcement of acts of “soft” law, first of all, from the view of regulation of private-law relations. While preparing the article the complex of methods was used, which lay on the basis of systematical and dialectical concepts. The main conclusion of the issue is the acknowledgement of the fact of the exercising of influence by the acts of “soft” law on regulation of private-law relations. This article is based on a combination of methods of cognition, which amounted to a systematic and dialectical approach. The author appeals to the general scientific methods (analysis, synthesis, induction, deduction) and to the specially-legal methods of learning: formal-legal, comparative legal, structural and functional.