The article describes the process of development and the results of validation of a novel questionnaire "Life success". The questionnaire aims to study the components of success in life of a person as a meta-resource in the self-regulation system. The development of the theoretical construct of the questionnaire was based on the results of the analysis of socio-philosophical, theoretical and applied psychological studies, which made it possible to understand the success in life as a triadic system-functional formation in the system of self-regulation of the personality that manifests itself as a mechanism, a trait and a state. This meta-resource allows a person to reflexively correlate personal goals, values and meanings with the processes and results of subjective activity, taking into account internal priorities and emerging socio-cultural conditions. The questionnaire consists of four subscales; each measures a certain component of success in life (reflexive mechanisms, integrative qualities, emotional experiences, values). The study showed (N = 705) that the subscales have good internal consistency (Cronbach's a 0.789–0.897), construct and convergent validity. Construct validity was confirmed by validating the model using confirmatory factor analysis. The convergent validity was confirmed by means of correlation analysis with the subscales of selected questionnaires that measure motivational and psychological states, resource capabilities, levels of subjective activity, and specifics of conscious self-regulation of behavior. Respondents with high indices of life success demonstrate the most positive motivational background, life satisfaction, existential fulfillment; show such resource opportunities as resilience and readiness for personal change; have high levels of subjective activity. Nevertheless, negative correlations of indices of life success with some styles of conscious self-regulation was an unexpected result.