The article is devoted to the analysis of the theoretical principles of administrative activity, the administrative and legal status of the chairman of the court, as well as the administrative powers in his activity. The managerial activity of the chairman of the court is related to the definition and implementation of a system of administrative procedures aimed at streamlining the internal organizational processes in a particular court with the help of executive-administrative, individual-power decisions, which are given to him within the administrative competence in order to ensure the effective functioning of the court the implementation of quality justice in it. There are three main blocks in the powers of the chairman of any court, according to which we also emphasize the need for legal support of these blocks: procedural powers derive from the general legal status of a judge; managerial (administrative) powers explicitly defined by law; powers not expressly provided for by law, but organically derived from the two previous ones. The nature of managerial authority characterizes the activities of the chairman of the court as the head, manager, coordinator of administrative processes occurring in the court, as well as the court apparatus. Unlike other law enforcement or criminal justice bodies, or public administration, judicial institutions are virtually devoid of externally-oriented functions (because they are the basis of justice), so managerial powers are primarily internal organizational and institutionalized and directed the court itself.