International safety standard for personal care robots, which is the key for realizing human safety, will be established soon. The nucleus of this standard is functional safety, which is a new safety concept. We need the interpretation about it, the technical know-how, and a lot of resource in order to develop personal care robots based on this standard, because it is very difficult to understand it. In the present study, we have developed the safety function of Roboticbed, which combines an electric bed and an electric wheelchair, so that it could meet the international standard for functional safety. This paper reports concrete example of this study.