The consultation rate in Japan is the second highest following South Korea among OECD countries and the number of its patients aged 65 or older has been increasing in particular. In addition, many of its elderly people are chronically ill patients who are in and out of the hospital and visit more than one hospital, and therefore there has been a sense of difficulty in sharing information between their hospitals and home. In this study, for the purpose of discussing challenges in information sharing necessary to achieve regional cooperation, the nursing records of 42 outpatients who had been receiving continuous supports at 475 beds of regional medical base hospitals . The analyses of the outpatient nursing records found that their main contents were (1) the incidences of adverse reactions, (2) in-home living and the lack of self-care, and (3) information on nursing-care shortage. Regarding information cooperation among nurses for outpatients, the analyses of the nursing records showed that there was no record on information cooperation with reginal medical institutions and such cooperation stayed within the hospital. For the promotion of comprehensive regional care, it is important to build a system in which nurses for outpatients conduct two-way nursing information cooperation with their home. From now on, it is necessary to discuss the development of a regional two-way information cooperation system based on the actual status of elderly people who frequently visit multiple institutions.