INTERNAL COMBUSTION ENGINE WITH COVER MEMBER ATTACHMENT STRUCTURE

[Problem to be Solved] [0002] To provide a cover member attachment structure for an internal combustion engine (1), in which the rigidity of a portion of an internal combustion engine main body (2) to which a cover member (40) is fastened can be increased, thereby making it possible to prevent the cover member (40) from vibrating. [0003] [Solution] [0004] In a chain cover (40) attachment structure for an engine (1) including a chain cover (40) attached to a front wall (4a) to cover a timing chain (14) that transmits power to an intake cam shaft (21) and an exhaust cam shaft (22) from a crankshaft (7), a central boss (45A) extending toward a front wall (4a) from a central portion in a width direction of the chain cover (40), and a central boss (4A) provided in the front wall (4a) and to be connected to the central boss (45A) with a bolt (33C), an intake-side oil supply pipe portion (15) includes a boss (15A) protruding toward the chain cover (40) from the front wall (4a), an exhaust-side oil supply pipe portion (16) includes a boss (16A) protruding toward the chain cover (40) from the front wall (4a), and the central boss (4A) is installed in a region (53) sandwiched between the boss (15A) and the boss (16A).