Three-wheel fork-lift truck having one rear steering wheel to be turned by a compact steering assembly of simple construction provides sufficient space for accommodating various kinds of attachments. The steering assembly is composed of a pinion provided with the rear steering wheel, a rack engaged with the pinion and a hydraulic cylinder as an actuator for moving the rack in the axial direction. By moving the rack in lateral direction either to the right or left, the pinion is rotated to turn the rear steering wheel via a steering shaft.