Studies show the connection between the self-efficacy of a counselor (or psychotherapist) and his success in professional and educational spheres. There are several self-efficacy assessment scales, but they have some problems associated with the situation, when entry-level professionals cannot assess their self-efficacy in high-level complexity tasks. There is no Russian-language tool to assess psychologist’s self-efficacy. The aim of the article is to develop a Russian-language tool for measuring counselor’s self-efficacy in three types of skills: problem-solving skills (explore/insight/ action), session management skills, and skills for managing complex clinical situations. This aim was achieved in the three steps: 1. Counselor Activity Self-Efficacy Scale (CASES) was translated and adapted; 2. The reliability-consistency and structure of the subscales in the translated questionnaire were checked using methods of mathematical statistics; 3. Translated questionnaire was validated using the following questionnaires: Emotional Intelligence questionnaire by D.V. Lyusin, Inter­per­sonal Reactivity Index (IRI) by Davis in adaptation by T.D. Karyagina, N.V. Kuh­tova, and Positive and Negative Affect Schedule (PANAS) in the adaptation by E.N. Osin. Sample of the study consisted of 412 practicing counselors and psychotherapists. The results are comparable with the data on the original version of the CASES questionnaire and allow us to talk about the construct validity of the Russian-language Self-Efficacy Scale. The developed questionnaire can be used to assess the self-efficacy of the Russian-speaking counselors and psychotherapists. The obtained questionnaire can be used to solve the following practical and theoretical problems: monitoring the educational progress in psychotherapeutic trainings, studying the factors that increase the self-efficacy and studying the degree to which self-efficacy assessments vary depending on specific client cases.