Abstract
A shrine building called "seiden" is a main building for a god. In the Ancient Times "seiden" of Izumo-taisha was a huge building. "Kariden" which is a temporary building for a god was smaller than "seiden". In the Mid-dle Ages a shrine building called Kariden-Zukuri was smaller than "seiden" in the Ancient Times. But it filled the role of a "seiden". So Kariden-Zukuri was different from "kariden" essentially. We have considered the reason why a form of Kariden-Zukuri came out in the Middle Ages. In the Ancient Times, "seiden" often tumbled down because of its hugeness. "Sengu" which is a rite of moving a god from an old srine building to a new building was not done until "seiden" tumbled down. In the Middle Ages after the Katei era (1235), the shrine building never tumbled. "Sengu" was done irrespective of tumbling. Furthermore after 14th century "sengu" was done at about regular interval. Tumbling is an unusual affair and defilement to a god. Thus so as not to tumble and so as to reconstruct reg-ularly to maintain, Kariden-Zukuri was worked out in the Middle Ages.
