Social welfare has transformed from a provider-centered welfare into a user-centered welfare. This trend have to increase the right to welfare and convenience for users. If the goal of social welfare guaranteed the respecting man`s life and dignity, we had not regarded service users as the weak in the welfare system. Japan has already prepared administrative care system for positive solution for social welfare service receipt right of the frail elderly who the decision ability is insufficient and the handicapped. It is important in us at point become accomplished policy approach of government that prepared for increase of old person who need longterm care. The purpose of this study is to analyze the structure and characteristics of the advocacy system, which has been institutionalized to aid the use of social welfare services in Japan`s social welfare systems recently. In order to conduct such purpose, this paper examined the develpomental process and the background of institutionalization of Majority Guardianship System and advocacy system in Japan.