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In Nara City and its vicinities, there are several Azekuras. The Azekura is an old wooden treasure house for preserving valuable things of the temple. The Azekura of Shosoin is the most famous of Azekuras and is keeping many rare treasures in the world during the past about 1200 years in an excellent state of preservation. The Azekura has no pillar and special walls built up by piling long woods (Azeki) with triangle cross-section, and its floor is sufficiently separated away from the ground surface to get good ventilation of air under the floor. Some indoor-meteorological observations and investigations were carried out about the effects of characteristic structures of Azekura on the preservation of valuable treasures, and following results were obtained. 1. Annual variations of air temperature and humidity in Azekura are similar to the respective variations in open air, but daily variations of them are very different between in Azekura and in the open air. The amplitudes of daily variations in Azekura are reduced to about 11% in air temperature and about 10% in humidity, compared with the respective amplitudes of daily variations in the open air. Annual mean values of air temperature and humidity in Azekura are about 14℃ and 75% respectively. The climatic feature of Nara basin seems to serve for safekeeping of the treasures in Azekura and then, above annual mean values may be regarded as a standard condition for good preservation of the treasures. 2. The clearances among the woods (Azeki) of walls do not seem to be changed by the expansion or contraction of each wood caused by the change of open air conditions and then, the flux of air into Azekura through the clearances of them will not be influenced by weather. 3. The amplitude of humidity variation is largely reduced in wooden cases (Karabitsu) put in Azekura. This reduction will be closely related to the hygroscopic property of wooden materials, which contribute to the preservation of valuable treasures in wooden cases. 4. Good ventilation of air under the floor of Azekura will effectively interrupt the moisture to inflow inside the room of Azekura.
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