The elderly population increases rapidly while younger population becomes decreasing year by year in Japan. People over 65 years old are estimated to reach over 27 % of population by the year 2025. In order to facilitate the participation of elderly individuals and to integrate them with other generations in the rapidly aging society, we need various strategies to solve social problems. The present occupational environments are not always fit to elderly workers. It is an urgent issue that we should redesign occupational environments regarding physical and mental deterioration of elderly people. 370 elderly workers over 60 years-old and 430 workers from 40 to 49 years-old completed questionnaires. Questions were done about preferred age-group to work with, major concern of elderly capability to work with, major desired design to extend elderly employment, concerns to their working environments, own physical deterioration etc. Fundamental design concept in occupational environments based on symbiotic relations is discussed in this paper.