An engine device comprising a cylinder block pivotally supporting a crankshaft so that the crankshaft is rotatable, wherein opposite side portions (301, 302) of the cylinder block along a crankshaft axial direction have, on one of their ends relative to the crankshaft axial direction, projecting portions (304, 305) protruding in a direction away from the crankshaft, and reinforcing ribs (306, 307, 308, 309, 310, 311) provided between side walls and the projecting portions (304, 305) of the opposite side portions (301, 302) so that the reinforcing ribs (306, 307, 308, 309, 310, 311) are flared at their sides close to the corresponding projecting portions (304, 305), the projecting portions (304, 305) and the reinforcing ribs (306, 307, 308, 309, 310, 311) being integrally formed with the cylinder block, two mount attachment pedestals for mounting an engine mount are provided on each of the opposite side portions (301, 302) of the cylinder block, and each of the reinforcing ribs (306, 307, 308, 309, 310, 311) extends along the crankshaft axial direction to a position close to another end opposite to the one end relative to the crankshaft axial direction, wherein first reinforcing ribs (309, 311) 2. of said reinforcing ribs (306, 307, 308, 309, 310, 311) are coupled with each of the mount attachment pedestals; characterized in that a part of a lubricating oil passage provided in the cylinder block is disposed in a position relatively close to one side portion out of the opposite side portions (301, 302), wherein a second reinforcing rib of said reinforcing ribs (306, 307, 308, 309, 310, 311) is arranged so as to overlap the position where the part of the lubricating oil passage is disposed in a side view. wherein opposite side portions (301, 302) of the cylinder block along a crankshaft axial direction have, on one of their ends relative to the crankshaft axial direction, projecting portions (304, 305) protruding in a direction away from the crankshaft, and reinforcing ribs (306, 307, 308, 309, 310, 311) provided between side walls and the projecting portions (304, 305) of the opposite side portions (301, 302) so that the reinforcing ribs (306, 307, 308, 309, 310, 311) are flared at their sides close to the corresponding projecting portions (304, 305), the projecting portions (304, 305) and the reinforcing ribs (306, 307, 308, 309, 310, 311) being integrally formed with the cylinder block, two mount attachment pedestals for mounting an engine mount are provided on each of the opposite side portions (301, 302) of the cylinder block, and each of the reinforcing ribs (306, 307, 308, 309, 310, 311) extends along the crankshaft axial direction to a position close to another end opposite to the one end relative to the crankshaft axial direction, wherein first reinforcing ribs (309, 311) 2. of said reinforcing ribs (306, 307, 308, 309, 310, 311) are coupled with each of the mount attachment pedestals; characterized in that a part of a lubricating oil passage provided in the cylinder block is disposed in a position relatively close to one side portion out of the opposite side portions (301, 302), wherein a second reinforcing rib of said reinforcing ribs (306, 307, 308, 309, 310, 311) is arranged so as to overlap the position where the part of the lubricating oil passage is disposed in a side view.