A manufacturing method for a hollow rack bar made of a hollow shaft material and including a toothed section which has a rack on an outer surface and a shaft section which is formed thinner than the toothed section, the manufacturing method comprising: drawing the hollow shaft material through between a die and a plug by using the die and the plug, and preforming regions of the hollow shaft material including a toothed section forming region configured to form the toothed section and a shaft section forming region configured to form the shaft section to have thicknesses (t1, t2) according to the regions respectively; and forming the rack at the toothed section forming region of the hollow shaft material which is preformed, wherein the plug has a first working section provided coaxially and adjacent to a second working section having a larger diameter than that of the first working section, as working sections to define inside diameters of the hollow shaft material, and wherein the shaft material is used as a base material having a sectional shape which is substantially constant in the axial direction of the shaft material and an outside diameter larger than an outside diameter of the hollow rack bar, wherein in the preforming, the plug is caused to move in an axial direction of the shaft material in an interior of the shaft material by a driving unit, and the distal end region of the shaft material is cut off, after completion of the preforming, characterized in that in the preforming, the drawing of the hollow shaft material is performed by a drawing unit having a chuck clamping a distal end region of the shaft material and an actuator configured to pull the chuck in a drawing direction of the shaft material, in that a control unit controls the drawing unit and the driving unit, and in that in the preforming, when the toothed section forming region passes through the die, the first working section of the plug is disposed by the driving unit inside a working section of the die configured to define an outside diameter of the hollow shaft material based on an amount by which the chuck of the drawing unit pulls the shaft material, and when the shaft section forming region passes through the die, the second working section of the plug is disposed by the driving unit inside the working section of the die based on the amount by which the chuck of the drawing unit pulls the shaft material. drawing the hollow shaft material through between a die and a plug by using the die and the plug, and preforming regions of the hollow shaft material including a toothed section forming region configured to form the toothed section and a shaft section forming region configured to form the shaft section to have thicknesses (t1, t2) according to the regions respectively; and forming the rack at the toothed section forming region of the hollow shaft material which is preformed, wherein the plug has a first working section provided coaxially and adjacent to a second working section having a larger diameter than that of the first working section, as working sections to define inside diameters of the hollow shaft material, and wherein the shaft material is used as a base material having a sectional shape which is substantially constant in the axial direction of the shaft material and an outside diameter larger than an outside diameter of the hollow rack bar, wherein in the preforming, the plug is caused to move in an axial direction of the shaft material in an interior of the shaft material by a driving unit, and the distal end region of the shaft material is cut off, after completion of the preforming, characterized in that in the preforming, the drawing of the hollow shaft material is performed by a drawing unit having a chuck clamping a distal end region of the shaft material and an actuator configured to pull the chuck in a drawing direction of the shaft material, in that a control unit controls the drawing unit and the driving unit, and in that in the preforming, when the toothed section forming region passes through the die, the first working section of the plug is disposed by the driving unit inside a working section of the die configured to define an outside diameter of the hollow shaft material based on an amount by which the chuck of the drawing unit pulls the shaft material, and when the shaft section forming region passes through the die, the second working section of the plug is disposed by the driving unit inside the working section of the die based on the amount by which the chuck of the drawing unit pulls the shaft material.