Abstract
In my previous paper (part 1〜part 4), I discussed that the number of furniture in the household has increased in recent years. This paper is concerned with the historical change in housing design effected by the tendency. Many furniture in a paticular room require the expansion of its space, and at the same time, the extra corners are also required. To settle as many furnitures as possible in the corner of a room, new kinds of furnitures such as built-in ones have been required year by year. These siluations have started to make a new kind of room.
