In Hagia Sophia, the deterioration of the lime plaster wall and side walls are considered to be caused by the condensation of water on the wall surface and water migration inside the side walls. On the ground level, deterioration of the wall surface is more severe in the north part than in the south part. In the second cornice, wall surface deterioration is more severe than on other floors. As the first step in clarifying the causes of these damages and developing appropriate measures, the following topics were examined: 1) Measuring the precise temperature and humidity profile in Hagia Sophia; 2) Identifying the deteriorated parts inside and outside the walls; 3) Measuring the moisture content on the inside surface of the walls. Main results obtained are as follows: 1 . Relative humidity in the north aisle and the staircase on the ground level is the highest especially in summer when it reaches over 90%. Condensation might occur on the wall in these areas. 2 . Moisture content of the northwest area is the highest and that of the southeast is second highest. 3 . Significant deterioration of the second cornice is found on the northwest semi-dome where exfoliation of the repaired plaster is confirmed. The southeast semi-dome is also deteriorated but the southwest semi-dome is less deteriorated than elsewhere. 4 . One of the major causes for the high moisture content in the walls is possibly rainwater penetration. Especially, sealing the gap between the walls and roof seems to be effective in preventing moisture penetration at the exterior walls. Condensation on the walls is also considered as another cause.%本研究は，ハギア?ソフィア大聖堂内部の結露や劣化の違いの原因を明らかにし，今後の保 存対策について提案を行うことを目的として，本報告では，ハギア·ソフィア大聖堂内部の塩 湿度性状を明らかにするために2010年9月に現地に設置された温湿度センサーの測定結果と 2011年9月に行った壁面の劣化状態と含水率分布の現地調査結果について述べた。
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