A bearing apparatus, comprising: a crankshaft main bearing (19; 19'; 19") for a crankshaft for an internal combustion engine; and a journal section of the crankshaft which is rotatably supported by the main bearing, wherein the journal section includes a lubricating oil path extending therein, and an inlet opening of the lubricating oil path that is formed on an outer circumferential surface thereof, and wherein the main bearing is composed of a pair of semi-cylindrical bearings (17; 17'; 17", 18; 18'; 18"), and any one of the semi-cylindrical bearings (17; 17'; 17") has an oil groove (17a; 17a'; 17a") formed on an inner circumferential surface thereof, the oil groove extends in a circumferential direction at least through a central portion of the one semi-cylindrical bearing in the circumferential direction and is arranged so that the center of the width of the oil groove in an axial direction aligns with the center of the inlet opening of the journal section, and an end portion (17E; 17F) of the oil groove in the circumferential direction does not extend to an end surface (17A; 17B) of the one semi-cylindrical bearing in the circumferential direction and therefore the inner circumferential surface extends between the end portion of the oil groove in the circumferential direction and the end surface of the one semi-cylindrical bearing in the circumferential direction to form a separation inner circumferential surface therebetween, and the end surface of the one semi-cylindrical bearing in the circumferential direction to which the oil groove does not extend, and an end surface (18A; 18B) of the other semi-cylindrical bearing in the circumferential direction which is joined to the end surface of the one semi-cylindrical bearing each comprise inclined surfaces (17C; 17D; 18C; 18D) on an inner circumferential surface side that extend throughout an entire length in the axial direction, so that an axial direction groove (24A; 24B) is formed at a joint portion of the pair of semi-cylindrical bearings, and the separation inner circumferential surface extends between the axial direction groove and the oil groove, characterized in that a length L1 of the separation inner circumferential surface in the circumferential direction is smaller than a length L2 of the inlet opening of the journal section in the circumferential direction, so that the oil groove is communicable with the axial direction groove via the inlet opening of the lubricating oil path. a crankshaft main bearing (19; 19'; 19") for a crankshaft for an internal combustion engine; and a journal section of the crankshaft which is rotatably supported by the main bearing, wherein the journal section includes a lubricating oil path extending therein, and an inlet opening of the lubricating oil path that is formed on an outer circumferential surface thereof, and wherein the main bearing is composed of a pair of semi-cylindrical bearings (17; 17'; 17", 18; 18'; 18"), and any one of the semi-cylindrical bearings (17; 17'; 17") has an oil groove (17a; 17a'; 17a") formed on an inner circumferential surface thereof, the oil groove extends in a circumferential direction at least through a central portion of the one semi-cylindrical bearing in the circumferential direction and is arranged so that the center of the width of the oil groove in an axial direction aligns with the center of the inlet opening of the journal section, and an end portion (17E; 17F) of the oil groove in the circumferential direction does not extend to an end surface (17A; 17B) of the one semi-cylindrical bearing in the circumferential direction and therefore the inner circumferential surface extends between the end portion of the oil groove in the circumferential direction and the end surface of the one semi-cylindrical bearing in the circumferential direction to form a separation inner circumferential surface therebetween, and the end surface of the one semi-cylindrical bearing in the circumferential direction to which the oil groove does not extend, and an end surface (18A; 18B) of the other semi-cylindrical bearing in the circumferential direction which is joined to the end surface of the one semi-cylindrical bearing each comprise inclined surfaces (17C; 17D; 18C; 18D) on an inner circumferential surface side that extend throughout an entire length in the axial direction, so that an axial direction groove (24A; 24B) is formed at a joint portion of the pair of semi-cylindrical bearings, and the separation inner circumferential surface extends between the axial direction groove and the oil groove, characterized in that a length L1 of the separation inner circumferential surface in the circumferential direction is smaller than a length L2 of the inlet opening of the journal section in the circumferential direction, so that the oil groove is communicable with the axial direction groove via the inlet opening of the lubricating oil path.