抄録
A building notation, which are compose of 'Ken' and 'Men', had established in the early Heian period. And there is a method that 'Ken' is the numbers of a space between the posts on longitudinal direction at 'Moya' (main building), 'Men' is the numbers of 'Hisashi' (lean-to), which are attached to four sides of 'Moya'. This method were ever clear by the late Dr. Yasushi Adachi at first. Also he apointed out that the 'Ken' and 'Men' notation are in common use on the both period of Heian and Kamakura, and were substitution other notation for that in the later period. In this article, I think some causes for above-mentioned substitutioning. There were a premise term for consist of the 'Ken' and 'Men' notation. It is included in the method of building construction, above all in the roof-construction of that time. Namely, a building were composed of 'Moya' and 'Hisashi', and the span of 'Moya' frame-work were the only one. Now, I became aware that 'Moya's span increase to two or three spans in the building of the Muromachi period. This means a denial of the principle for the 'Ken' and 'Men' notation.
