Objective: This study aimed to examine the effects of collaborative activities by utilizing picture books in order to improve the self-regulation and perspective- taking abilities among four-year-olds. Methods: A total of 52 four-year-olds(control group 26, experimental group 26) attending two classes at D kindergarten located in B city participated in this study. Before and after the activities, all participants individually took a social perspective taking ability instrument and rated their self-regulation with a teacher. Data were analyzed by conducting ANCOVA in the way of setting pre-test scores as the covariate and post-test scores as the dependent variable. Results: First, the total and subarea of self-regulation in the experimental group was higher than the control group. Second, the cognitive and emotional perspective taking abilities in the experimental group were higher than the control group in all cares. Conclusion/Implications: The results of this study suggest that collaborative activities using picture books are effective in improving young children’s self- regulation and perspective-taking abilities.