A method for manufacturing a rack bar having a first rack and a second rack provided away from each other in an axial direction, with an angular positional difference around an axis of the rack bar being provided between the first rack and the second rack, the method comprising: forming a first flat surface extending in the axial direction on an outer circumference of a first end portion of a single hollow shaft member; forming a second flat surface extending in the axial direction on an outer circumference of a second end portion of the hollow shaft member at a location having the angular positional difference with respect to the first flat surface; forming the first rack by press-fitting a mandrel into the hollow shaft member through a first opening of the hollow shaft member on a side of the first end portion of the hollow shaft member in a state in which a teeth die corresponding to the first rack is pressed against the first flat surface to cause a material of the hollow shaft member at the first flat surface to plastically deform toward the teeth die; and forming the second rack by press-fitting the same mandrel or a different mandrel into the hollow shaft member through a second opening of the hollow shaft member on a side of the second end portion of the hollow shaft member in a state in which the same teeth die or a different teeth die corresponding to the second rack is pressed against the second flat surface to cause a material of the hollow shaft member at the second flat surface to plastically deform toward the same teeth die or the different teeth die, characterized in that the forming of the second flat surface comprises flattening the second end portion of the hollow shaft member by a flat molding surface of a press die, wherein the flattening of the second end portion comprises holding the hollow shaft member in a state in which a positioning surface of a jig (107, 108) is brought into contact with the first flat surface, the positioning surface being arranged to be inclined with respect to the flat molding surface of the press die by a predetermined angle (θ) equivalent to the angular positional difference. forming a first flat surface extending in the axial direction on an outer circumference of a first end portion of a single hollow shaft member; forming a second flat surface extending in the axial direction on an outer circumference of a second end portion of the hollow shaft member at a location having the angular positional difference with respect to the first flat surface; forming the first rack by press-fitting a mandrel into the hollow shaft member through a first opening of the hollow shaft member on a side of the first end portion of the hollow shaft member in a state in which a teeth die corresponding to the first rack is pressed against the first flat surface to cause a material of the hollow shaft member at the first flat surface to plastically deform toward the teeth die; and forming the second rack by press-fitting the same mandrel or a different mandrel into the hollow shaft member through a second opening of the hollow shaft member on a side of the second end portion of the hollow shaft member in a state in which the same teeth die or a different teeth die corresponding to the second rack is pressed against the second flat surface to cause a material of the hollow shaft member at the second flat surface to plastically deform toward the same teeth die or the different teeth die, characterized in that the forming of the second flat surface comprises flattening the second end portion of the hollow shaft member by a flat molding surface of a press die, wherein the flattening of the second end portion comprises holding the hollow shaft member in a state in which a positioning surface of a jig (107, 108) is brought into contact with the first flat surface, the positioning surface being arranged to be inclined with respect to the flat molding surface of the press die by a predetermined angle (θ) equivalent to the angular positional difference.