The social background of child care and rearing has changed rapidly today in Japan. Also young children's life rhythm has changed compared with before. These disorders of life rhythm cause big influence to young children's mind and body health. To improve young child's mind and body health, it is effective that parents improve the life rhythm at home. Therefore, the educational campaign to parents about young child's life rhythm was held. In this research, the relationship between improvement of parent's consciousness and life rhythm of young child is clarified. As a result, half of parents' consciousness about young child's life rhythm has changed. Moreover, that parent has changed their behavior to improve their living at home. In addition, these parents cause improvement of young child's life rhythm remarkably. From these result, to improve young child's life rhythm, it was suggested that it is effective to transform the parents' consciousness.