A halved sliding bearing (1) has a recess (7) formed in a circumferential direction from an outer peripheral edge of a mating surface (5) of a semi-cylindrical bearing main body (3). To prevent formation of a burr to an inside of the recess (7) during formation of the mating surface (5), an entirety of at least one edge segment of a peripheral edge of the recess (7) opening on a circumferential end surface of a semi-cylindrical member (23) as an unprocessed body of the bearing main body (3), the at least one edge segment intersecting with an axial direction of the member (23), is chamfered. The mating surface is formed by cutting the circumferential end surface such that a cutting blade (31) firstly reaches the chamfered edge in the peripheral edge of the recess (7). Thus, the bearing main body is produced.