It is investigated to introduce CM method to public construction project, so far CM method is introduced to private building project in Japan. In case of popularizing CM method in Japan, it is anticipated that new safety management will be appeared different from present safety management to be performed by general construction company on these projects. The role and responsibility of safety management is notclear between CMR (Construction manager) and contractors on Occupational Safety and Health Act in Japan. In this paper, we try to be clear safety problem of CM, and study proper safety management of CM.