This study estimated demands of public nursing homes for older adults between 2020 and 2050 and the adequate supply for the next 10 years. In Korea, increasing the number of public nursing homes for older adults is aimed for reinforcing publicness, enhancing the quality of care by reducing the negative effects of marketization, and directly dealing with the demands of nursing home placement primarily due to rapid aging. This study attempted to describe the detailed-estimate of demands and supply for nursing home for older adults in order to advocate for raising the number of public nursing homes, which should be the policy alternative of strengthening publicness. It is expected that Korea will exhibit the fast growth of the absolute number of older adults, the changes in the proportion of aging population, and the changes in the regional distribution of older adults for the next 30 years of rapid aging. This study estimated the demands of public nursing homes for older adults by using the nursing home placement rate of older adults by age groups, the regional distribution of older adults, and the regionally differential number of nursing home beds. The results indicated that the demands of nursing homes for older adults will be increased from 231,175 on 2020 to 822,978 in 2050. To satisfy fifty percent of the total increasing demands, 394 public nursing homes in the metropolitan cities and Gyeonggi-do (near Seoul) and 334 in other regions should be built until 2030. This findings imply that the 2nd national long-term care plan that stated the additional 50 public nursing homes (70 beds per home) should be expanded. This study provides policy implications by showing the estimate of demands of nursing homes during the extended-period, and proposing detailed-adequate supply for public nursing homes.