The present study developed a Japanese version of the Session Evaluation Questionnaire (J-SEQ), which was translated from the original version of the SEQ (Form 5), and examined its reliability and validity. The respondents were 103 counselors. Exploratory factor analysis (maximum likelihood estimation with varimax-rotation) and confirmatory factor analysis were used to examine the factorial structure of the J-SEQ. The results showed that the J-SEQ had substantial reliability (Cronbach's alpha) and factorial validity. The factorial structure, response tendencies, and the correlations of factors of the J-SEQ were consistent with the original SEQ (Form 5).