A steering system for an industrial machine comprising: a body-articulating angle changing means for changing a body-articulating angle of the industrial machine , by receiving and discharging pressurized oil; first and second steering means provided in the industrial machine and operated by an operator; a first signal pressure output means for outputting a first signal pressure (PP1) mechanically responsively to an operation of the first steering means ; a second signal pressure output means for outputting a second signal pressure (PP2) mechanically responsively to an operation of the second steering means ; a third signal pressure output means which selects whether or not the third signal pressure output means outputs a third signal pressure (PP3), in response to the second signal pressure (PP2) fed to the third signal pressure output means ; and feeding and discharging control means for controlling feeding and discharging of the pressurized oil with respect to the body-articulating angle changing means , characterized in that the feeding and discharging means is coupled to the first signal pressure output means and to the third signal pressure output means , and is configured to control feeding and discharging of the pressurized oil based on the first signal pressure (PP1) or the third signal pressure (PP3) fed to the feeding and discharging control means; wherein in a state where the first steering means is operated, the first signal pressure output means outputs the first signal pressure (PP1), while the third signal pressure output means stops outputting of the third signal pressure (PP3) regardless of whether the second signal pressure (PP2) is fed to the third signal pressure output means , and the feeding and discharging control means operates based on the first signal pressure (PP1) fed to the feeding and discharging control means . a body-articulating angle changing means for changing a body-articulating angle of the industrial machine , by receiving and discharging pressurized oil; first and second steering means provided in the industrial machine and operated by an operator; a first signal pressure output means for outputting a first signal pressure (PP1) mechanically responsively to an operation of the first steering means ; a second signal pressure output means for outputting a second signal pressure (PP2) mechanically responsively to an operation of the second steering means ; a third signal pressure output means which selects whether or not the third signal pressure output means outputs a third signal pressure (PP3), in response to the second signal pressure (PP2) fed to the third signal pressure output means ; and feeding and discharging control means for controlling feeding and discharging of the pressurized oil with respect to the body-articulating angle changing means , characterized in that the feeding and discharging means is coupled to the first signal pressure output means and to the third signal pressure output means , and is configured to control feeding and discharging of the pressurized oil based on the first signal pressure (PP1) or the third signal pressure (PP3) fed to the feeding and discharging control means; wherein in a state where the first steering means is operated, the first signal pressure output means outputs the first signal pressure (PP1), while the third signal pressure output means stops outputting of the third signal pressure (PP3) regardless of whether the second signal pressure (PP2) is fed to the third signal pressure output means , and the feeding and discharging control means operates based on the first signal pressure (PP1) fed to the feeding and discharging control means . <EOS>