Working Alliance Inventory-Short Revised (WAI-SR) is known to have good psychometric properties, but no Japanese version has been developed till date. In this study, we created a Japanese version of the WAI-SR, i.e., the J-WAI-SR, and examined its reliability and validity. As a result of comparing the several fit indices (Post Predictive p-value and DIC) of each model with the factor structure of J-WAI-SR by Bayesian confirmatory factor analysis, it was determined that J-WAI-SR has a three-factor structure. With regard to reliability, sufficient internal consistency was obtained (α=.93, .96), and the test-retest reliability was within the acceptable range (ICC agreement=.75). Therefore, we could establish the reliability and validity of J-WAI-SR.
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