A rack guide comprising: a synthetic resin-made rack guide base body which has an arcuate concave surface provided at one end face thereof, a hollow recessed portion provided at another end face thereof, and a circular through hole which at one end thereof is open in a central portion of the arcuate concave surface and which at another end thereof is open in the hollow recessed portion; and a curved sliding plate piece (26, 81) which has an arcuate concave surface for supporting an arcuate outer peripheral surface of a rack bar slidably, an arcuate convex surface which is brought into close contact with the arcuate concave surface of said rack guide base body, and a tubular projecting portion which is provided integrally on the arcuate convex surface, and which is open in the arcuate concave surface and has an interior closed with respect to the hollow recessed portion, characterized in that, said projecting portion has a tubular portion provided integrally on the arcuate convex surface at one end thereof, a closed bottom portion provided at the other end of the tubular portion, and a bulged portion which is on one side thereof provided integrally on the tubular portion and is on another side thereof provided integrally on the closed bottom portion and is expanded radially outwardly, said curved sliding plate piece (26, 81) is secured to said rack guide base body as the tubular portion is press-fitted into the circular through hole and the bulged portion is brought into pressure contact with said rack guide base body around the other end of the circular through hole, said hollow recessed portion is defined by a cylindrical inner peripheral surface of the rack guide base body and an annular ceiling surface of the rack guide base body, a plurality of reinforcing vertical ribs are integrally formed on the cylindrical inner peripheral surface in such a manner as to be spaced apart at equal intervals in a circumferential direction, a plurality of reinforcing horizontal ribs are integrally formed on the ceiling surface in such a manner as to be connected to the respective vertical ribs and to be spaced apart at equal intervals in the circumferential direction, and said circular through hole is open at the ceiling surface to the hollow recessed portion. a synthetic resin-made rack guide base body which has an arcuate concave surface provided at one end face thereof, a hollow recessed portion provided at another end face thereof, and a circular through hole which at one end thereof is open in a central portion of the arcuate concave surface and which at another end thereof is open in the hollow recessed portion; and a curved sliding plate piece (26, 81) which has an arcuate concave surface for supporting an arcuate outer peripheral surface of a rack bar slidably, an arcuate convex surface which is brought into close contact with the arcuate concave surface of said rack guide base body, and a tubular projecting portion which is provided integrally on the arcuate convex surface, and which is open in the arcuate concave surface and has an interior closed with respect to the hollow recessed portion, characterized in that, said projecting portion has a tubular portion provided integrally on the arcuate convex surface at one end thereof, a closed bottom portion provided at the other end of the tubular portion, and a bulged portion which is on one side thereof provided integrally on the tubular portion and is on another side thereof provided integrally on the closed bottom portion and is expanded radially outwardly, said curved sliding plate piece (26, 81) is secured to said rack guide base body as the tubular portion is press-fitted into the circular through hole and the bulged portion is brought into pressure contact with said rack guide base body around the other end of the circular through hole, said hollow recessed portion is defined by a cylindrical inner peripheral surface of the rack guide base body and an annular ceiling surface of the rack guide base body, a plurality of reinforcing vertical ribs are integrally formed on the cylindrical inner peripheral surface in such a manner as to be spaced apart at equal intervals in a circumferential direction, a plurality of reinforcing horizontal ribs are integrally formed on the ceiling surface in such a manner as to be connected to the respective vertical ribs and to be spaced apart at equal intervals in the circumferential direction, and said circular through hole is open at the ceiling surface to the hollow recessed portion.