The purpose of this paper is to investigate body surface area of japanese. 45 Japanese young adult subjects were measured. The body surface was divided into the anatomical regions. Measurements were conducted covering the body with small pieces of inelastic tape. It was found the following. 1) Signiticant difference was observed between partial rate of body surface area in relation to sex. There was a significant difference in relation to body forms. 2) Partial rates of body surface area were significant difference from the other measured studies by DuBois. Takahira and Fujimoto・Watanabe. 3) Single component calculation formula of body surface area, Height or Weight, gave higher error by height-weight formula. 4) The surface area calculated by S=100.315W^ H^ was very closer fit to the measured surface area. This formula was widely applicable to sex and body form. Modified DuBois height-weight formula was S=72.18W^ H^