A sliding bearing 1 which is interposed between a tube 4 and a rack shaft 7 includes a bearing body 11 and two elastic rings 13 and 14 fitted on an outer surface 12 of the bearing body 11, and the bearing body 11 has slits 26 extending from an end face 22 to this side of an end face 24, slits 27 extending from the end face 24 to this side of the end face 22, an inner surface 33 having a sliding surface 28, and an outer surface 12 on which are formed grooves 34 respectively receiving the elastic rings 13 and 14 and projections 35 and 36 respectively provided on axial end portions 23 and 25 with the grooves 34 disposed therebetween.