A connecting rod bearing for rotatably supporting a crank pin of a crank shaft of an internal combustion engine, the crank pin comprising a cylindrical barrel portion, a lubricating oil path extending through the cylindrical barrel portion, and at least one exit opening of the lubricating oil path formed on an outer peripheral surface of the cylindrical barrel portion, wherein the connecting rod bearing comprises a first half bearing and a second half bearing, the first half bearing and the second half bearing being combined into a cylindrical shape by bringing respective circumferential end faces of the first half bearing and the second half bearing into contact with each other, each of the first half bearing and the second half bearing comprises a back metal layer and a slide layer, the slide layer constituting a slide surface (13, 23) of each half bearing (10, 20), the second half bearing comprises an oil groove formed on a slide surface side to extend over the entire length of a circumferential direction of the second half bearing, and at least one oil hole passing through from an inner surface of the oil groove to a bearing outer peripheral surface of the second half bearing, the first half bearing comprises a first partial groove formed on a slide surface side to extend from the circumferential end face of the first half bearing on a forward side of a rotation direction of the crank pin toward a circumferentially central portion side of the first half bearing, and a second partial groove formed on the slide surface side to extend from the circumferential end face of the first half bearing on a backward side of the rotation direction of the crank pin toward the circumferentially central portion side, and the oil groove of the second half bearing, and the first partial groove and the second partial groove of the first half bearing communicate with each other when the respective circumferential end faces of the first half bearing and the second half bearing are brought into contact with each other, characterised in that the first half bearing comprises a cylindrical depression formed to communicate with the first partial groove at a circumferential end thereof that is located on the circumferentially central portion side of the first half bearing, the slide surface between a circumferential end of the second partial groove that is located on the circumferentially central portion side of the first half bearing, and a circumferential end of the cylindrical depression that is located on the circumferentially central portion side of the first half bearing extends at a circumferential angle (θ1) of 80° to 160°, an axial center line of the cylindrical depression extends toward an axial center line of the first half bearing, an inner diameter of the cylindrical depression measured on the slide surface is 100% to 150% of an axial length of the first partial groove that is measured at a location where the first partial groove communicates with the cylindrical depression, a depth of the first partial groove that is measured at the location where the first partial groove communicates with the cylindrical depression is equal to or more than a thickness of the slide layer, and a maximum depth of the cylindrical depression is equal to or more than the depth of the first partial groove that is measured at the location where the first partial groove communicates with the cylindrical depression, but is configured so that the cylindrical depression does not pass through to a bearing outer peripheral surface of the first half bearing.