Abstract Introduction Older people who receive nursing-care-service have multiple fall-risk than well-functioning older people. To our knowledge, there is no appropriate fall-risk assessment for them. Most of the fall-risk assessments in previous researches were subjective. Thus, we aimed to develop a new fall-risk score included major fall-related factors such as objective motor-functions for older who receive nursing-care-service, and to verify the validity of the score. Method We recruited 264 older people who receive nursing-care-service. They were randomly allocated to the fall-risk score development group (Development group) and the score validity group (Validity group). All assessment items were major fall-risk related factors. As motor-function tests, Short-Physical-Performance-Battery (SPPB) including single-task-walking (STW), and dual-task-walking (DTW) were performed. Dual-task-cost (DTC) was computed. The DTC score was made with 0 = lower than 20%, 1 = more than 20%, 2 = incomplete DTW. As a cognitive-function test, Mini-Mental-State-Examinations was examined. Basic-health-related-information and past one-year fall-history were obtained via patient care records. Information of fear of falling was obtained via interview. In the Development group, the association between fall-history and the major fall-related factors were analyzed using multiple-logistic-regression analysis. Based on these results, we developed the 4-point fall-risk score consisted of DTC score and SPPB score (0=more than 10-point, 1=7 to 9 point, 2=less than 6-point). Finally, in the Validity group, the association between fall-history and the fall-risk score was investigated using logistic-regression analysis, and we computed area-under-the-curve (AUC). Results In the Development group, the fall-history was associated with SPPB (Odds ratio95%CI = 0.730.61-0.87), and DTC score (Odds ratio95%CI = 2.501.14-5.79). In the Validity group, our fall-risk score was significantly associated with fall-history AUC=73%, sensitivity=67%, specificity=71% . Conclusion In the fall-risk assessment for older people who receive nursing-care-service, our fall-risk score included SPPB and DTC are useful. The validity of our fall-risk score was confirmed.