[Purpose] This study examined the influence of range of motion of the ankle joints on elderly people's balance ability. [Methods] We conducted a four-week experiment using 60 out of the 89 elderly people who used B senior health facility, as subjects. TETRAX stability, synchronization were conducted to measure balance ability. We examined correlations between TETRAX balance and ankle joint ROM. Student's t-test and Pearson correlation coefficients were used for the statistical analyses. [Results] There were significant correlations between measurement items of TETRAX stability and synchronization and movement of the ankle joint. [Conclusion] It was found that as had plate was stable in measurement using ankle joint ROM and TETRAX after closing eyes, balance was maintained with Dorsi Flexion.