This study examined the hierarchical structure of the categories of Japanese emotion and the configuration of each category in multidimensional space. Using the questionnaire based on the paired comparison method, 167 undergraduates participated in the similarity-rating of 20 emotion words. The data were analyzed with cluster analysis and multidimensional scaling. The result of cluster analysis showed that there are 5 separate emotion categories such as love, joy. sadness, anger and fear. The results of the multidimensional scaling showed these categories vary along two-dimensions: positive-negative dimension and weak strong dimension. That suggests cross-cultural universality of the basic emotion and the originality of Japanese emotion.