Japan has increased the elderly and physically handicapped. Elderly and physically handicapped A.D.L.(Activities of Daily Living) is reduced. Improvement of Elderly and physically handicapped A.D.L. is problem. In improvement of A.D.L., we were focused on the support of walking. Walker is mobility device on daily basis. But there are accidents caused by overturn as a problem of walker. This study was made to develop overturn prevention device to walker. First, to establish an index for determining the overturn. We measured locus of body (angle of joint), Speed of walker, Force acting on walker, Positional to walker and user, and other relevant factors. And we examine the correlation between the elements, and establish index for determining the overturn.
