Disclosed is a sliding bearing having a cylindrical shape, including: a Fe alloy back metal layer on an outside diameter side of the cylindrical shape and a sliding layer on an inside diameter side; and a first and second circumferential direction end surfaces, the first and the second circumferential direction end surfaces facing each other, a plurality of hardened convex portions projecting toward the second circumferential direction end surface being formed on the first circumferential direction end surface, a plurality of hardened concave portions corresponding to the plurality of hardened convex portions being formed on the second circumferential direction end surface, a first hardened area being formed on each of the hardened convex portions of the first circumferential direction end surface and its vicinity, and a second hardened area being formed on each of the hardened concave portions of the second circumferential direction end surface and its vicinity.