This study stands on long-term longitudinal research of 12 years from the training stage to the initial and middle terms. The study traced the changes in childcare worker identities and clarified the relationship between long-term changes in childcare worker identities and autobiographical memories. To be more specific, the study continuously applied the Multidimensional Ego Identity Scale (Tani, 2001a) to the training school graduation period, the initial term, and the transition from initial form to mid-career. Also, the study looked back on the past from the mid-career period. The childcare worker was subsequently asked for descriptions of childcare episodes as autobiographical memories. As a result, it turned out that there were four patterns of changes in the identities of childcare workers: “descending group,” “ascending group,” “low sustaining group,” and “high sustaining group.” These change patterns appeared to match the descriptions of the corresponding autobiographical memories. The study sorted out each group using extracted keywords and the like.