The article focuses on the study of the concept of the effectiveness of detention of a person in criminal proceedings. It is emphasized that criminal procedural detention is an important tool of the criminal procedural activity of the prosecution. Not enough attention has been paid to the definition of the effectiveness of criminal procedural detention in the scientific literature. When posing the problem statement, it is noted that the study of the concept of the effectiveness of detention is the starting point in the study of ways to improve the effectiveness of such coercive measures. The relevance of the study of the concept of the effectiveness of criminal procedural detention is also enhanced by the fact that achieving a clear understanding of the effectiveness of detention can serve as a reliable basis for developing and improving the effectiveness of criminal procedural detention. The effectiveness of criminal procedural detention takes into account the balance of interests of the state and the individual, the balance of legal capabilities of law enforcement agencies and effective mechanisms for protection against arbitrariness. There are three signs of the effectiveness of criminal procedural detention: prompt achievement of the goal; legality on the basis of a qualitative law; short-term restriction of the right to liberty. During the presentation of the main material the procedural characteristic of each of them is given. We do not consider the selected criteria of efficiency of criminal procedural detention to be exclusive. The effectiveness of any criminal procedure institution is not a static phenomenon. It is dynamic and depends on the specific circumstances of the criminal proceedings. Based on the study of the above features, the concept of the effectiveness of criminal procedural detention is formulated. The effectiveness of criminal procedural detention is the ability to detain in a legal manner, regulated by a quality criminal procedural law, by short-term restriction of the right to freedom to promptly achieve the goal of ensuring proper conduct of the suspect and the information support of the initial stage of pre-trial criminal proceedings.