[Introduction] It is already fifty years since the Japanese law of physical therapists and occupational therapists has been effective. The physical therapist is referred by the law as "the professionals who implements the physical therapy to persons with disabilities under the prescription of medical doctors". In fifty years, however, the target of physical therapy has been significantly expanded. The subject for physical therapy now includes the patients in acute disease just after the surgical operation in addition to those in rehabilitation stage. In other words, the physical therapy is now recognized as the indispensable intervention to the subject with acute as well as chronic disorders. On the other hand, due to a rapid transition of the society into the aged society, prevention of diseases, and decline of activity capacity due to the aging have become major issues for the physical therapy.