A configuration factor between the human body or its equivalent simple model and a rectangular plane is necessary for calculation of the mean radiant temperature and the rate of radiant heat exchange between the human body and its surroundings. A cylindrical element may be most useful for this purpose. Ibamoto and Nishi (1968) first defined configuration factors between a clyndrical element and a rectangular plane. However, their model may be insufficient because the top and bottom end of the model were not considered for the calculation. Then, configuration factors for cylindrical elements with top and bottom ends were redefined and calculated. The calculations are now graphically shown in some charts. This factor depends on the ratio of height h to diameter d of the cylindrical element. The configuration factors for cylindrical elements with the ratio h:d=1:1 and h:d=3:1 fairly corresponds to those for the seated and standing human elements reported by Fanger (1970), respectively.