Abstract
This paper aimes firstly to clear the floor area composition of assembly facilities in nation-wide 371 cities, towns and villages, and secondly to clear the relation between floor area composition and room composition, total floor area and their plotting unit. The essentials in this paper are as follows; (1) The total floor area and floor area composition is strongly provided by its plotting unit. And in lower plotting unit, the variety of floor area composition is considerably reduced. (2) The variety of floor area composition is more shown in large total floor area and in upper plotting unit. (3) Above-mentioned variety is typified in "hall-enlarged type" and "robby-enlarged type".