The purpose of this study is to clarify what impact the regional mutual support businesses (RMBs) give on the structure of urban life. The impact was clarified by a case study of a group for in-home care services in which local residents are involved. The service quality was classified as high or low in terms of the degree of specialization and cooperation, and then compared with the services provided in the existing (public, private and voluntary) sectors. The findings show that, depending on the differences in the quality of service, there are three types of impact on the structure of urbn life. 1) A market economy type that pursued convenience in the current structure of urban life, without promoting relationships with other residents in the region. 2) A type to restore mutual support systems in the region, or RMB to serve to promote resident relationships. 3) A type to create a professional mutual support. This is a new type of professional services within the mutual support system. RMBs, an alternative sector, are managed in different ways. There are indications that the RMB participants seek to formulate their own cooperative systems to process tasks in the current structure of life. Their efforts seem to be directed toward creating an out-sourcing type of mutual support system with a time lag element.