to the width of the quarter part to which the large load is applied whereby the sliding resistance of the peripheral ends and the central part is increased and fuel efficiency is worsened on the other hand according to the sliding bearing 3 of this embodiment the width of the quarter part 12 c to which the large load is applied is large and the widths of the peripheral ends 12 a and the central part 12 b are small whereby the sliding resistance can be reduced at the part to which the large load is not applied while securing enough oil film at the part to which the large load is applied next an explanation will be given on the manufacturing method of the sliding bearing 3 having the above configuration firstly a long and narrow material wound coil like is supplied intermittently by a predetermined length at a time and the long and narrow material is cut along a direction perpendicularly a lengthwise direction thereof whereby a flat plate material 21 which is strip like shaped is obtained subsequently as shown in fig3 end surfaces of four sides of the flat plate material 21 are cut parts which are made into the.