Purpose: In the era of antiretroviral treatment (ART), treatment of HIV has become more manageable, and most patients with HIV benefit from long-term therapy in Japan. The aim of this qualitative study was to examine the experiences of patients with HIV/AIDS receiving mid-and long-term care in Japan. Methods: A qualitative study was performed using semi-structured interviews at an outpatient clinic of a university hospital in the Greater Tokyo area. A total of 31 Japanese patients with HIV who had been receiving treatment for at least a year were interviewed in Japanese. Data from these interviews were analyzed bycontent analysis (Krippendorff, 1980). Results: The data were organized into the following seven themes:"feelings toward diagnosis of HIV infection";"perceptions and behavior after diagnosis of HIV";"attitudes toward HIV therapy";"fear and hope for the future";"feelings toward professional support";"life changes after HIV therapy"; and"struggles in relationships with others". Conclusions: Some participants accepted themselves as HIV-positive, some did not when they were diagnosis. This difference of reaction had effect on attitudes toward HIV therapy. But all participants continued mid- and long-treatments owing to feeling well and receiving support from professionals. Additionally, it found that patients were felt stigma of HIV-positive similarly to another Asian countries. Therefore, we should provide the entire Japanese society with knowledge about HIV/AIDS and be early and constant intervention by professional teams after being infected.