he study was to analysis and to realize the role of workers as case manager, working in the Heemangjiwon team. The study was applied to qualitative method involving Strauss & Corbin grounded theory, which was good at the exploring the essence of worker's experience as a case manager. The date was collected from 11 worker, working as case manager in the Heemangjiwon team through in-depth interview. The date was analysized by the procedures of grounded theory-open coding, performed conceptualization(33) and categorization(8), axial coding, carried out category and process analysis, selective coding, performed core category. The results of the study as following: in axial coding the casual conditions was the problems of role performance in individual, organization, team, network level; the core phenomenon was the effect of active role performance as case manager; the contextual conditions was the supervisor's lack of recognazation on case management and the worker's recognition of the responsibility & role of case manager; the strategy of action/interaction was the establish the role in the level of organization, team, network; the intervention conditions was the quality supervision and education. In selective coding four types of role performanece was founded, the individual role establishment promotion type, the indivldual role establishment frustration type, the organization role establishment promotion type, the organization role establishment frustration type. The implication of the result of the study was as follows: firstly, in theoretical aspect the result offered the comprehensive understanding on worker's role as case manager in Heemangjiwon team, secondly in practical aspect supervisor's education was one of crucial factors for the successful establishment the role of a case manager