The purpose of this study was to clarify the relationship between bed control and the work environment of nurses working in Advanced Treatment hospitals. A questionnaire survey of 719 nurses and 57 managers working in the wards of one Advanced Treatment hospital was surveyed on anonymous self-administered questionnaires. As for the work environment, the correlation between 21 items and 7 items of bed control on the 3 subscales of the Japanese version of NWI-R was examined. The impact of items with significant correlation on the work environment was examined by multiple regression analysis. In addition, the impact on the work environment was examined by staff nurses and managers. The number of valid responses by staff was 598 (response rate: 95.5%), and the number of valid responses by managers was 46 (response rate: 97.2%). The results of multiple regression analysis showed that among staff nurses, "emergency hospitalization is natural when there are empty beds," "cooperation between wards," "discharge coordination," and "coordination with doctors" have positively significant influences related to the work environment. It was suggested that managers need to work on bed control in recognition of differences in evaluation with staff.