A sliding bearing 1 includes a cylindrical bearing body; slits provided in the bearing body; straight grooves provided on an inner side of the bearing body in such a manner as to extend in an axial direction A and respectively disposed between adjacent ones of the slits which are adjacent in a direction B about an axis; a sliding surface which is provided on the inner side of the bearing body and partially severed in the direction B about the axis by the slits to and the straight grooves; a fitting groove provided in an outer surface of the bearing body; and an elastic ring which is fitted in the fitting groove. Each of the straight grooves are closed on an end face side and is open on an end face side.