Social enterprise refers to a business organization which produces goods or service to satisfy socially unmet needs. The quality of social goods or service gives competitive edges to social enterprises in common with commercial firms. So TQM (total quality management), as a management practice for enhancing business performance and quality, can be applied to the social enterprise sector. Specially, social care service industry, the main area of social economy, can more easily adopt TQM practices for performance excellence, because most social care services are classified as human encounter services in which TQM usually work well. In this paper, we describe the case of TQM in Dasomi Foundation, a model social enterprise that provides quality nursing service, to show that quality management system can be successfully implemented in the fields of social enterprise. This case will provide management discipline with a good benchmark to promote TQM movement across the social enterprise sector.