In this study, based on the statistical data and future estimates, the number of the elderly who are likely to use elderly housing with life support service ("elderly" hereinafter is used in this context) in 2025 was calculated, and the derivation method of basis for estimating the quantity of elderly housing needed to be constructed or improved was demonstrated as an essay. In addition, by specifying the minimum living expense in case of living in elderly housing and by comparing this fi gure to the data of income levels used as bases for determining premiums for long-term care insurance, the balance between the number of elderly housing in need for public fi nancial support, such as housing benefi t or construction aid, and the number of the same deemed possible to be developed in the market was examined. The trial calculations in this study were made with the cooperation of 7 local municipalities, most of which are in the Tokyo metropolitan area that is supposed to have high demand for elderly housing. The result showed that, as elderly people's situation is greatly different area to area, it is necessary to establish a standard on elderly housing construction and improvement on a municipality-by-municipality basis taking into account the local circumstance of each area.
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