Recent research suggests that mindfulness, a nonjudgmental present-centered attention, may decrease anger. The present study investigated the relationship between mindfulness and anger by focusing on the multidimensionality of mindfulness. Japanese undergraduate students (N=636) completed the questionnaire measuring five facets of mindfulness (Five-Facet Mindfulness Questionnaire) and several anger tendencies (i.e., anger proneness and duration of anger). Results showed that three facets of mindfulness, nonjudge, act-aware, and nonreact, were negatively associated with anger tendencies when other two facets, observe and describe, were positively associated with those variables. Moreover, high-observe group, which scored high on observe and low on nonjudge, was higher on measures of anger tendencies compared to high-nonjudge group, which scored low on observe and high on nonjudge and act-aware. Findings indicate the relationship among mindfulness facets and suggest the efficacy of some facets for decreasing anger. Implications for understanding the mechanisms of mindfulness on treating problematic anger are discussed.