Half thrust bearing

A half thrust bearing for receiving an axial force of a crankshaft of an internal combustion engine, the half thrust bearing having a semi-annular shape and having a sliding surface for receiving the axial force and a back surface opposite to the sliding surface,

• wherein the sliding surface comprises a plurality of recesses, each recess having a recess surface,
• wherein the recess surface is recessed from the sliding surface toward the hack surface of the half thrust bearing and is convex toward the back surface of the half thrust bearing in cross-sectional view in a circumferential direction of the half thrust bearing, and
• wherein the recess surface comprises a plurality of circumferential grooves, the circumferential grooves being recessed from the recess surface toward the back surface of the half thrust bearing, and the circumferential grooves extending along the circumferential direction of the half thrust bearing so that smooth surfaces and the circumferential grooves are alternately arranged on the recess surface.