Abstract
medical accidents by falling fracture, it is tend to increase every year. According to the previous year is due to falling fracture about 30% of medical accidents. Medical institution, falling fracture countermeasure is an important issue. We are elucidate behind falling that had to give a serious head injury by previous studies. In this study, we conducted a survey of head injuries effect due to falls by floor material and falling posture. As a result, the angular velocity in head injury risk is high, regardless of the floor material. the HIC showed no difference floor materials.