<p>This paper presents a durability evaluation of a bearing bracket for the inner shaft system of an electric vehicle. A finite element model of the bracket was developed to predict its mode shape and dynamic stiffness, and the simulation results were validated through impact excitation tests conducted on a bracket installed in a vehicle. Road-induced vibrations were simulated using actual driving vibration data obtained from the electric motor and reduction gear of the vehicle. Frequency-domain stress responses were computed using the base excitation method, and time-domain stress histories were reconstructed to perform fatigue analysis. Subsequently, the damage fractions were calculated using the S–N curve and rainflow-counting method under amplified vibration conditions. The results confirmed that the damage fractions remained below 1.0, even when the input vibrations were increased three fold, thus indicating sufficient structural durability of the bracket during long-term operation. This study demonstrated the effectiveness of integrating test-based validation and realistic vibration environments in the durability assessment of electric vehicle components.</p>