HALF BEARING AND SLIDING BEARING

Provided is a semi-cylindrical shaped half bearing (31, 32; 41, 42). The half bearing has an inner surface forming a sliding surface (7). The sliding surface (7) includes a plurality of recesses (71). Each recess (71) has a smooth recess surface recessed from the sliding surface (7) toward an outer diameter side of the half bearing. The recess surface forms a convex curve toward the outer diameter side of the half bearing in a cross-sectional view in any direction perpendicular to the sliding surface (7). The recess surface includes a plurality of circumferential grooves (71G). The circumferential grooves (71G) are recessed from the recess surface toward the outer diameter side of the half bearing. The circumferential grooves (71G) extend along a circumferential direction (M) of the half bearing so that smooth surfaces (71S) and the circumferential grooves (71G) are alternately arranged on the recess surface.