The merits of a small day care center for the elderly are now being recognized once again in Japan. It is taking the place of a large facility that accommodates many elderly people. A small house- like center has the advantage of satisfying a specific need for each elderly person. On the other hand, a large facility tends to make the senile users be worse, because it is difficult for each person to be treated with tender care. There said to be 600 day- care centers in Japan. Recently, a day care center converted from private house increases its number. This study attempts to make clear what advantage has been brought when a traditional rural house is reused as a day care center. To grasp of it, we surveyed examples of a day care center, accommodation and group housing that were originally traditional houses in a rural village. We define the 'trans- programming' as the change of usage with slight alterations. This day care center is for the senile elderly. A woman established it in 1997. She had worked for a large nursing facility for the elderly. To make good use of her experience, she borrowed a traditional house (built 110 years ago) in her village to convert it into a day care center. Her purpose was to sustain ordinary lives for the senile elderly, which had been lost in a large facility.She controlled the alterations to be minimal. The traditional house plan is maintained. There remains a step between half earth- and half raised- floors. She thinks it important for the elderly to feel the step. 'If it is what the elderly have got used to, they will crawl to move.' The elderly enter the earth floor by wheelchairs. They easily move to the raised floor, because the original step is as the same height as a wheelchair.Traditional door fittings are also preserved. The manager said those fittings are useful when the elderly happen to stay overnight. 'The senile elderly occasionally have hallucination when they sleep alone. They can calm down when they feel others staying next room partitioned by sliding doors covered with cloth, and when they sense a light of next room through the transom.There is no air conditioner. The manager thinks much of sense of hotness and coldness. 'When it's hot, ordinary people wipe the sweat. When it's cold, they put their clothes on. For the senile elderly, it is also important.'This care in the center has proved very successful. Some elderly people have managed to show their call of nature by gesture or facial expression. Others have become quiet and self- controlled when they return homes at night. This leads to support the family who looks after the elderly. The manager has arranged an accommodation for the senile elderly who can not return their homes. It is located within a few minutes' walk from the center. It was also an old dwelling house. Both the partition and the room layout are preserved. A staff sends the elderly to bed and prepares their breakfast in the next morning. The manager and the staff try to maintain the elderly's daily life to go to the day- care center. The manager has set up a group- housing for elderly people, too. It is also a reused traditional house in the village. Nothing is changed, besides the bathroom is renovated and handrails are attached to a staircase. Conclusions1: Advantages of the 'trans- programming' This type of reuse proved to have two advantages. One is to provide well-functioning care. The other is to preserve traditional rural houses. The trans- programming in this center is applicable to other vacant houses in Japanese rural villages. Most of the elderly in villages spent their younger times in traditional houses. A day- care center converted from a rural house would be felt at home for them. 2: Relation between the 'trans- programming' and the 'building type' Those three buildings reflect the concept of the manager. She pursues to sustain ordinary lives of the elderly even when they move to a facility. Consequently, all the buildings are reused traditional houses with minimal alterations. This fact shows that it is important for sustaining the elderly's ordinary lives to preserve the building type not to build a new facility for elderly use. The building type means spatial composition peculiar to the village, which the elderly have got used to. The important aspect of the trans-programming is to sustain the building type.