Abstract
Since the static wheel load imbalance may fail the running performance of railway vehicle, the static wheel load balance should not be neglected. The causes of wheel load imbalance are as follows; unequalness of the height of primary suspentions which causes the imbalance in bogie, and unequalness of the height of secondary suspentions or mass eccentricity of the car body, which cause the imbalance in car body. Considering the background of the imbalances, authors tried tests to estimate static wheel load imbalance caused by imbalance in car body. Regarding the results of them, we developed a equipment to estimate the static wheel load imbalance.