There are three lines in the study of the development of child's causality concept. The first of them deals with child's perception of formal characteristics of causal relation between events - temporal and spation correlations of cause and effect. The second one investigates child's animistic notions about the universe revealing in verbal and practical manner. The third line aims at the study of child's ability to perceive and make out the reasons of a person's behaviour. Special attention is paid to the study of causality concept in infants showing their "early competence" in perception of causal relations.