This study was used to develop a Japanese version of the International Personality Item Pool-Interpersonal Circumplex and examined its reliability and validity. Participants included 625 Japanese university students. They completed the IPIP-IPC-J and one or two other scales: the Japanese version of Ten Item Personality Inventory (Oshio et al., 2012); a short form of the Japanese Big Five Scale (Namikawa et al., 2012); the Japanese Version of Dark Triad Dirty Dozen (Tamura et al., 2015); the Friendship scale (Okada, 1995); or the Assertion Inventory (Murayama et al., 1991). The IPIP-IPC-J was administered again to 65 participants five weeks later to determine test-retest reliability. The results generally supported the reliability and validity of the IPIP-IPC-J.