The objective of this paper is to estimate the natural convective heat transfer coefficients for the human body at sedentary posture and its segments, based on measured dry heat dissipation rate with heat flow meters. The following results were obtained : 1) The natural convective heat transfer coefficients for trunk, forearm, thigh and shin had distribution over the skin. The mean values of local coefficients at each segment were calculated and factors were determined to estimate the mean value of natural convective heat transfer coefficients from that at the measured point. 2) The estimated local convective heat transfer coefficient for the peripheral segments were agreed with the previous experimental data and the estimation formula based on non-dimen- sional heat transfer coefficient formula concerning simple solids which were simulated to the human segments. The convective heat transfer coefficients for a head and a trunk were fairly agreed with the previous studies. 3) Convective heat transfer coefficient for the whole body were calculated as the weighted mean of the local convective heat transfer coefficients for each segments. The value stood at 3.7 to 3.8W/m2<C under this experiment's condition. If using the mean coefficient based on the its distribution, the coefficient stood at 5.2 to 5.5W/m2<C
