The relevance of the research of this problem is caused by the theoretical and practical needs of a specific concept of the crime object as one of the corpus delicti signs essentially the determining and defining its object and objective side, thereby--the nature of socially dangerous act. Besides, being a facultative sign of corpus delicti, the object of a crime contains in more than a half of the crime components provided by the Special Part of the Criminal Code of the Russian Federation. The purpose of article consists in research of the most problematic issues of an object of a crime and on the basis of critical understanding of the existing definitions of the search term to offer our own definition of the crime object. The basic methods of research were formal-logical, historical, systemic, structural and comparative--legal methods which have allowed to consider the evolution of the views of legal scholars to the search term and to distinguish the criminal legal concept of crime object from the related concepts and from the Criminal Procedure notion of the injured person. In article the object of a crime is provided not as a thing of a material world, including only inanimate objects but as more difficult phenomenon, the certain material and (or) intellectual substratum characterizing, and sometimes determines the other elements and features of a crime, illegal impact on which or in connection with which (concerning which) a real threat is caused or a real threat of substantial harm to legally protected public relations (personal benefits) is inflicted. The study results are of practical value for teaching staff, which lead lessons and specialized courses of the criminal law cycle, and also have some importance for law enforcers in the legal assessment of the offense, the qualification of crimes, delimitation of object of a crime from methods and tools of its commission.