To provide a motor-driven power steering unit support structure that can absorb mounting errors of a steering shaft. A vehicle includes a steering shaft rotatably supported on a vehicle body frame. A steering bar handle is attached to the upper end of the steering shaft. A motor-driven power steering unit is mounted onto the lower end of the steering shaft, and the vehicle includes at least two front wheels. The motor-driven power steering unit is supported on the vehicle body frame from the vehicle width direction. A front support member and a rear support member for supporting the motor-driven power steering unit are provided in the vehicle body frame on the front and rear sides, with the steering shaft therebetween.