The purpose of this study is that prevent sport injury for senior thereby facilities manager has to have law knowledge about legal system from sport injury for senior who use sport facilities. When senior are doing exercise they can get injury than other ages, so they have to attention themselves during exercise. And when they start to do exercise they have to look around slip and danger stuff in public sport facilities. There have responsibility to manager and owner of private sport facilities if there has some injury during senior are doing exercise, they have to process immediately.