Abstract
The aim of the study is to point out essential and critical factors to be considered at the stage of planning and design of hospitals in the case of suffering from great disasters such as earthquakes, because increasing possibilities are anticipated in hospitals accepting a number of casualties suffered from great disasters which will simultaneously happened in a region. In order to attain the aim, extensive literature and hearing/observation surveys were carried out targeting to the hospitals attached by Great East Japan Earthquake on March 2011. As the result, several items were pointed out.