A method for adjusting a steering system comprising: loosening a yoke plug, which has been temporarily fastened to a zero clearance excess position which refers to a position where the yoke plug is continuously fastened after coming into contact with the support yoke which is thus subjected to elastic compressive deformation by the contact with the yoke plug; wherein the steering system includes: a rack shaft that makes linear motion inside a housing; a pinion shaft rotatably supported by the housing to mesh with the rack shaft; the support yoke housed in a guide hole provided in the housing so as to be able to move back and forth along the guide hole and supporting the rack shaft so as to allow the rack shaft to slide along an axial direction of the rack shaft; the yoke plug fixed with screw-threaded in the guide hole; and a bias member interposed between the yoke plug and the support yoke to bias the support yoke toward the rack shaft, characterized in that in the loosening of the yoke plug, the yoke plug is loosened to a position where an axial position of the yoke plug reaches a target clearance between the support yoke and the yoke plug using, as a reference, a position where a rate of a change in the axial position of the yoke plug with reference to the support yoke increases rapidly with respect to a change in an angular position of the yoke plug. loosening a yoke plug, which has been temporarily fastened to a zero clearance excess position which refers to a position where the yoke plug is continuously fastened after coming into contact with the support yoke which is thus subjected to elastic compressive deformation by the contact with the yoke plug; wherein the steering system includes: a rack shaft that makes linear motion inside a housing; a pinion shaft rotatably supported by the housing to mesh with the rack shaft; the support yoke housed in a guide hole provided in the housing so as to be able to move back and forth along the guide hole and supporting the rack shaft so as to allow the rack shaft to slide along an axial direction of the rack shaft; the yoke plug fixed with screw-threaded in the guide hole; and a bias member interposed between the yoke plug and the support yoke to bias the support yoke toward the rack shaft, characterized in that in the loosening of the yoke plug, the yoke plug is loosened to a position where an axial position of the yoke plug reaches a target clearance between the support yoke and the yoke plug using, as a reference, a position where a rate of a change in the axial position of the yoke plug with reference to the support yoke increases rapidly with respect to a change in an angular position of the yoke plug. a rack shaft that makes linear motion inside a housing; a pinion shaft rotatably supported by the housing to mesh with the rack shaft; the support yoke housed in a guide hole provided in the housing so as to be able to move back and forth along the guide hole and supporting the rack shaft so as to allow the rack shaft to slide along an axial direction of the rack shaft; the yoke plug fixed with screw-threaded in the guide hole; and a bias member interposed between the yoke plug and the support yoke to bias the support yoke toward the rack shaft, characterized in that in the loosening of the yoke plug, the yoke plug is loosened to a position where an axial position of the yoke plug reaches a target clearance between the support yoke and the yoke plug using, as a reference, a position where a rate of a change in the axial position of the yoke plug with reference to the support yoke increases rapidly with respect to a change in an angular position of the yoke plug.