Inadequate support and neglect of children with developmental disabilities often engenders "secondary symptoms", such as school non-attendance, withdrawal, and criminal acts. Through a questionnaire survey of resource rooms in elementary and lower secondary schools in the Tokyo metropolitan area, the present study assessed the actual conditions that students with developmental disabilities confront, focusing on maladjustment problems of and problems of educational support for students with mild developmental disabilities. The survey results revealed many possible reasons for these students' school maladjustment. Suggestions for improvement were also described. Furthermore, the results revealed that cooperation among guardians, schools, resource rooms, counseling organizations, and medical institutions is extremely insufficient. It is strongly urged that schools and related organizations promote guardians' understanding of their children's disabilities.