Background: Few studies have examined the associations between urban design attributes and older adults' physical function.Especially,it is not well known how built-environment attributes may influence physical function in Asian cities.The aim of this study was to examine associations between objectively measured environmental attributes of walkability and objectively assessed physical function in a sample of Japanese older adults.Methods: Cross-sectional data collected in 2013 from 314 older residents (aged 65-84 years) living in Japan were used.Physical function was estimated from objectively measured upper-and lower-body function,mobility,and balance by a trained research team member.A comprehensive list of built-environment attributes,including population density,availability of destinations,intersection density,and distance to the nearest public transport station,were objectively calculated.Walk Score as a composite measure of neighborhood walkability was also obtained.Results: Among men,higher population density,availability of destinations,and intersection density were significantly associated with better physical function performance (1-legged stance with eyes open).Higher Walk Score was also marginally associated with better physical function performance (1-legged stance with eyes open).None of the environmental attributes were associated with physical function in elderly women.Conclusion: Our findings indicate that environmental attributes of walkability are associated with the physical function of elderly men in the context of Asia.Walking-friendly neighborhoods can not only promote older adults' active behaviors but can also support their physical function.