The purpose of this study was to evaluate the effectiveness of the TIPI-J (a Japanese version of the Ten Item Personality Inventory: Oshio, Abe, & Cutrone, 2012) in volunteer panel Web surveys. First, a Web survey was conducted (264 males, 256 females, age range 20–69 years), and the internal consistency of the TIPI-J was tested by correlation analysis. Moreover, the concurrent validity and discriminant validity of the TIPI-J was tested by correlation analysis between the TIPI-J and another Big-Five scale (BFS short version: Uchida, 2002). These results indicated that the TIPI-J had satisfactory internal consistency and adequate validity. Next, as a result of a two-wave volunteer panel Web survey (316 males, 306 females, age range 20–69 years, 4-week interval), the TIPI-J showed satisfactory test–retest reliability (r＝.72～.84). These results confirmed that the TIPI-J had sufficient validity and reliability in volunteer panel Web surveys in Japan. Finally, the effectiveness of the TIPI-J and its development were discussed.