In order to analyze the human properties for impacts, the authors are developing the finite element (FE) model of the whole human body. In this paper, the thorax model was developed and validated by comparison with published cadaver test data. Some injury data of side impacts were calculated using this thorax model. The results are as follows: (1) The response of this thorax model agreed well with that of cadavers. (2) Injury data for side impacts can be calculated adequately using this thorax model.