Introduction: Different research studies point out the importance of social competence as a protective factor against antisocial behavior. They likewise alert us of the importance of having valid, reliable instruments that measure these constructs in early childhood. Method: The objective of this research is to validate the subscales of the "Preschool and Kindergarten Behavior Scale" (PKBS-2) and to propose a structural model thereof. A total of 1509 pupils from preschool education participated in this study. The data was analyzed using EQS 6.1 for the confirmatory factor analysis and SPSS 15.0 for the descriptive analyses. Results: The results reveal good fit indexes, high saturations and adequate internal consistency levels for the subscales of the Social Skills scale and of the Behavior Problems scale. Discussion and conclusions: The results show high reliability in terms of internal consistency, making the scales applicable in different contexts and specifically with Spanish samples. We observe that the two variables that make up the instrument can be measured independently and separately, yielding double information from the single questionnaire. (Contains 3 tables.)