For older adults to continue living in a community, they need to have a certain sense of security, especially in terms of the availability of healthcare in the community. The aim of this cross-sectional study was to explore important factors of the sense of security among older adults in their continued community living, with particular attention to hospital-led community activities. The participants comprised 252 randomly sampled older adults aged 65 years or older, living in a local community in western Japan, and ranging from being independent to physically and cognitively frail. Participants' sense of security in continued community living was assessed using a modified scale from past research on cancer care. Activities provided by local community organisations and hospitals were examined. The participants' mean age was 75.0 years, 144 (57.8%) were female and 32 (13.3%) were frail. Hospital-led groups (e.g. health lectures) and individual (e.g. health counselling) activities were used by 73 (30.5%) and 76 (31.9%) participants respectively. Among participants, 174 (73.4%) had participated in activities run by the local community, such as senior day celebrations or senior centre activities. A stronger sense of security was associated with participation in hospital-led individual activities (beta = 0.171,p = .036), being a member of a neighbourhood association (beta = 0.156,p = .020), frequency of contact with family members (beta = 0.145,p = .034) and lower depression (beta = -0.269,p < .001). Participation in community hospital-led individual activities may provide older adults opportunities to discuss their health-related concerns in a community setting, and thus might enhance their sense of security. In the aged society, the role of healthcare facilities may need to be expanded to facilitate outreach for older adults in the community to enhance their sense of security and actualise ageing in place.