A connecting rod bearing and crankpin assembly for rotatably supporting a crankpin of a crankshaft of an internal combustion engine, wherein: the crankpin comprises a cylindrical barrel portion, a lubricating oil path (5a, 5b) extending through the cylindrical barrel portion, and at least one discharge opening of the lubricating oil path (5a, 5b) formed on an outer peripheral surface of the cylindrical barrel portion, the connecting rod bearing comprises a pair of half bearings (31, 32) which are combined with each other to form a cylindrical shape, each of the half bearings (31, 32) has a main cylindrical portion including a circumferentially central portion of the half bearing (31, 32), the main cylindrical portion comprises a slide surface on a radially inner side thereof, and each of the half bearings (31, 32) also comprises crush reliefs (70, 70) formed on both circumferential sides of the slide surface so that a wall thickness at the crush relief is smaller than that of the main cylindrical portion, characterised in that at least one of the pair of half bearings (31, 32) comprises an axial groove (71, 71a) to accommodate the oil flow from the lubricating oil path, the axial grooves (71, 71a) extending in an axial direction on the slide surface between the circumferentially central portion and the crush relief located on a forward side in a rotation direction of the crankpin, and the axial groove (71, 71a) is apart from the circumferentially central portion by a circumferential angle of 10° or more toward the forward side in the rotation direction, and apart from the crush relief located on the forward side in the rotation direction of the crankpin by a circumferential angle of 10° or more. the crankpin comprises a cylindrical barrel portion, a lubricating oil path (5a, 5b) extending through the cylindrical barrel portion, and at least one discharge opening of the lubricating oil path (5a, 5b) formed on an outer peripheral surface of the cylindrical barrel portion, the connecting rod bearing comprises a pair of half bearings (31, 32) which are combined with each other to form a cylindrical shape, each of the half bearings (31, 32) has a main cylindrical portion including a circumferentially central portion of the half bearing (31, 32), the main cylindrical portion comprises a slide surface on a radially inner side thereof, and each of the half bearings (31, 32) also comprises crush reliefs (70, 70) formed on both circumferential sides of the slide surface so that a wall thickness at the crush relief is smaller than that of the main cylindrical portion, characterised in that at least one of the pair of half bearings (31, 32) comprises an axial groove (71, 71a) to accommodate the oil flow from the lubricating oil path, the axial grooves (71, 71a) extending in an axial direction on the slide surface between the circumferentially central portion and the crush relief located on a forward side in a rotation direction of the crankpin, and the axial groove (71, 71a) is apart from the circumferentially central portion by a circumferential angle of 10° or more toward the forward side in the rotation direction, and apart from the crush relief located on the forward side in the rotation direction of the crankpin by a circumferential angle of 10° or more.