Recent research on the phenomenon of infantile amnesia has focused on cultural differences in the characteristics of adults' earliest memories. Although such research provides new insights into infantile amnesia, little research has been conducted in Japan; therefore, comparable Japanese data was rather scarce. The purpose of this study is to show the characteristics of the earliest memories of Japanese adolescents. One hundred twenty-nine Japanese female university students provided their earliest memories, which were analyzed in detail in light of age and content (places, people, events, valences, five senses, and affects). In general, their earliest memories were similar to those of Europeans in both age and contents. Implications of this study for future research are discussed.