The purpose of this study was to examine through longitudinal data how one's cognition of one's mother changes from adolescence to adulthood. The subjects were twenty female graduates of a nursing junior college now in their thirties who had written their life histories as a report assignment in the college. After 11 years, they participated in interviews in which they were asked about their mothers, such as what kind of person their mothers were, or whether their feelings towards their mothers had undergone any changes. Comparisons were made between the descriptions of their mothers that they wrote from early childhood to period of junior college in 1994 and what they told in the interview in 2005. It was showed that for the positive feelings towards one's mother or meaning of mother there were the common parts that did not change over time. On the other hand, there was a tendency for negative aspects to be described objectively, in contrast to the rather strong feelings described up through their adolescence. As to relationship between cognition of their mothers in adulthood and that in adolescence, narratives about their mothers now were often similar to description of their life histories 11 years earlier ; many who described good relationship 11 years ago, also told positively now, many who described problem and conflict in relation before also told negatively now, and many who told in both aspects in interview now, described rare relationship in early childhood, then described problematic relation gradually as they got older, and good relationship in college period.