Aim. This article serves to introduce into scientific circulation a new questionnaire for measuring cultural capital, called CulCap-15. The questionnaire diagnoses three interrelated constructs: good manners (kindness, good upbringing), participation in high culture and orientation to educational success. Methods and materials. The research method was a survey of two samples of adults (n=1239, n=835) collected using the snowball method. In some analyses, the two samples were combined into one set. The material includes factor analyses to confirm the assumed structure of the tool, an analysis of the questionnaire’s internal reliability, and a path analysis documenting the tool’s associations with dimensions of the family of origin’s educational functionality and level of psychological capital. Results and conclusion. The research confirmed the 3-factor structure of the tool with the pre-postulated dimensions of cultural capital. These are good manners, participation in high culture and a sustained orientation to knowledge acquisition (educational success). These dimensions are correlated with each other, but their correlations with each other are moderate. For this reason, the recommendation is to consider them as relatively separate in multivariate analyses. The subscales of the questionnaire are factorially homogeneous and have a satisfactory level of internal reliability. Path analyses make it possible to consider the subscales as mediators in the relationship between family factors (parents’ education, the climate of the educational relationship in the family of origin, orientation to the child’s educational success and the child’s participation in high culture) and the level of psychological capital. This result confirms the accuracy of the measurement.