<p> The space, function, and equipment levels required for day care facilities for the elderly are being upgraded because various elderly people use these facilities, including those requiring a high degree of care. Hence, the subject is the reorganization of service functions and the space composition of the facilities. However, under the present circumstances, the functional training room and the dining room, where the floor spaces are large, serve as the saucer. Therefore, it is necessary to regulate the actual utilization of the functional training room and dining room.</p><p> This paper aims to explain the features of room usage for leases and juxtaposition day care facilities for the elderly by regulating the plan composition and corner arrangement pattern of the main room, considering the function of the room. The results are as follows:</p><p> 1) The plan compositions of the main room were classified into the MW type, in which the flooring space and the Japanese-style space form one room, the Mw type, which has a straw-matted floor with no partition in the main room, and the M type, which lacks space for a straw mat. Small-scale facilities are generally of the MW type. It has the advantage of dividing one room into two spheres. The Mw type has only a main room, with straw-matted floor spaces indoors, and the tatami space is considered the place for the elderly to talk, relax, and nap. The M/S type plan has a main room with flooring and a separate sub-room. The main room is used for free time, functional training, and meals, but there is only one separate sub-room, so correspondence is required in case places for naps are insufficient.</p><p> 2) The corners provided in the main room were regulated as follows. Free time, functional training, meals, and naps were selected as the fundamental corner, and the places for training, office work, table setting, preparation, and relaxation were situated at the corners. Since most facilities provided a nap corner, reserving a nap space is considered important. Relaxation space, used for rehabilitation or for users to spend free time, is also secured aside from the appointed seat. The institution rates of office and table setting corners are high, and the diversity of functionality of the main room, including management, is highlighted.</p><p> 3) Based on the relationship between the function and the place, the arrangement of the corner was set to either the LT affiliation, where the same sphere was used for meals and functional training, or the L+T affiliation, where the two spheres were divided. LT affiliation facilities are the main type, accounting for 70% or more. Additionally, there is much plan composition, especially of the MW type, in small-scale facilities. The FTN+N type of corner arrangement is used. Although there are few facilities of the L+T affiliation, corner arrangements of the FL+FTN or FL+FT+N type, where spheres were differentiated for meals and functional training, and the selection branch of the place for free time was collateralized exist. Additionally, users who relaxed at both corners during bathing and leisure time or naptime were seen. If a suitable arrangement of the nap corner where privacy were secured is possible, it will become the effective corner setting method of the main room.</p>