Cylinder block structure of engine

A cylinder block structure of an engine, the cylinder block structure comprising:

• a cylinder block having a cylinder block bottom wall;
• plural bearing caps configured to support a crankshaft that is disposed between the cylinder block and the plural bearing caps;
• an engine auxiliary device fastened to the cylinder block bottom wall and configured to be driven by the crankshaft;
• a bearing cap bridge fastened to the cylinder block bottom wall and configured to couple the plural bearing caps with one another;
• first fastening portions configured to fasten the bearing cap bridge to both of the cylinder block bottom wall and the plural bearing caps;
• second fastening portions configured to fasten the bearing cap bridge to the cylinder block bottom wall;
• and
• third fastening portions configured to fasten the engine auxiliary device to the cylinder block bottom wall, wherein
• the bearing cap bridge has edge portions extending with outlines recessed from the second fastening portions toward the first fastening portions, and
• when seen in an orthogonal direction to the cylinder block bottom wall, the third fastening portions are arranged within regions defined by the recessed outlines and first imaginary lines which pass through the second fastening portions and are orthogonal to an axial line of the crankshaft.