This paper reports the results obtained from the field measurements on indoor airborne bacteria and fungi in hospital environment. The measurements on airborne microbe concentration in waiting rooms of nine hospitals (A-I) were carried but from July 24 to August 24, 2006. Airborne bacteria concentrations were greatly influenced by the number of visitors. In the waiting rooms where many people visited, airborne bacteria concentrations were higher than 1500 cfu/m3 and this value is 3 times of the standard of Healthcare Engineering Association of Japan Standard HEAS-02-1998. Moreover, since airborne bacteria concentration is remarkably related to airborne particles larger than 2 micrometers, the measures to reduce coarse particles such as by introducing a high efficiency particulate air filter, and/or designing indoor airflow properly are necessary.