The present study examined relationships between self-disclosure, negative child-rearing attitudes of mothers and self-disclosure of children, and between self-disclosure of children and their adjustment to their classes. A causality (self-disclosure of mother would facilitate self-disclosure of children, negative child-rearing attitudes of mothers would inhibit self-disclosure of children, and self-disclosure of children would facilitate their adjustments to their classes) was also investigated. Subjects were 135 primary school and junior high school students. They filled out self-disclosure questionnaires for children, self-disclosure questionnaires for their mothers, and mother child-rearing attitudes scales. Their teachers checked their adjustment to their classes. The relationships and the causality were confirmed, except between negative child-rearing attitudes of mothers and self-disclosure of children. These were caused by the fact that child-rearing attitudes consisted of two factors. One factor facilitated self-disclosure of children and the other inhibited it.