Abstract
The incidence of heat disorders in July-August for Saitama prefecture were investigated in 2010. The incidence rate of heat disorders in Kumagaya was higher than in Saitama city. Sixty-five over ages occurred mainly in daily activities. Distribution of the daily maximum temperature on the day occurrence in the heat disorders in Saitama is lower than Kumagaya. Significant positive correlation was observed between the average incidence rate and daily maximum temperature. Distribution of the WBGT at daily maximum temperature on the day occurrence is also the same trend. In the results of multiple logistic models, significance was shown in the factor of WBGT at daily maximum temperature and population for 65 over ages.