A hydraulically driven and steered vehicle comprises a pair of axles differentially connected to each other, a traveling HST, a steering HST, a speed control operation device operative connected to a movable swash plate of the traveling HST, and a steering operation device operatively connected to a movable swash plate of the steering HST. A speed control linkage is interposed between the steering operation device and the swash plate of the steering HST. A hydraulic actuator and a hydraulic valve are connected to the steering control linkage so as to reverse the relative movement direction of the swash plate of the steering HST to the movement direction of the steering operation device depending upon the reversing of forward and backward traveling direction.