Case management in the area of mental health has traditionally been made centering around persons with chronic mental disability, but in recent days, its range has been expanded to groups with various problems or needs in mental health, that is to say various aspects of mental health including children, youth, groups with depressive disorder and case management on suicide survivors or suicide high risk groups. Also, a part of CSI mental health services among Community Social Service Investment(CSI) has recently been implemented to resolve blind spot according to changes in social structure. This study looked into the present condition of practice of case management in the area of mental health social welfare by dividing various recent changes in the environment of mental health services into traditional mental health services and CSI area which is a social service, and considered future assignments as follows. First, change of paradigm to prevention and early intervention in respect of mental health is required, not the perspective of traditional treatment and rehabilitation. Second, perspective to view provision of rehabilitation service from Employee Assistance Program(EAP) for the development of human capital is necessary. Third, breaking from existing role as a supplier, the nation must take effort to secure publicness of mental health system and narrow the space through the method of guaranteeing private sector’s autonomy for rationalization of delivery system for mental health of both public and private sectors. Lastly, with respect to future mental health services, local governments must take effort to induce development of mental health service programs matching local communities by understanding community’s specific needs for mental health.