For the first time in Russian, a book is published by the classic of developmental psychology, the outstanding English scientist John Bowlby (1907-1990), who laid the foundation for the systematic study of the formation of a child’s attachment to his mother. Bowlby's theory is based on extensive phylo- and ontogenetic material and implements the principles of an interdisciplinary approach. For psychologists and representatives of related sciences. Can serve as a textbook for students of psychological faculties, graduate students, teachers and specialists in the field of psychology and ethology.