Cylinder block and internal combustion engine provided with same

A cylinder block comprising:

• a bearing body having a fitting recess part to which a bearing cap is fittable, and a bearing part formed in the bottom surface of the fitting recess part and configured so as to axially support a crank shaft between the bearing body and the bearing cap in a rotatable fashion, wherein:
• the fitting recess part has a bottom surface corner part configured to be abutted by a corner part of the bearing cap;
• at the bottom surface corner part, a recess groove extends through the bearing body in a thickness direction of the bearing body, which is parallel to an axial direction of the crank shaft;
• and
• in a plane that is parallel to the thickness direction of the bearing body and extends through the recess groove, the recess groove has an arched shape and has a depth that is greatest at a center part of the bearing body in the thickness direction of the bearing body.