To firmly support an output shaft when the output shaft is provided on the cylinder head side past a crankshaft.

This V-engine is so formed that intake and exhaust valves are driven respectively by intake and exhaust cams provided in a cylinder head 7. A valve drive shaft 25 is rotatably provided inside a V-bank and oppositely to the crankshaft 2 across the output shaft 12. The power of the crankshaft 2 is transmitted to the valve drive shaft 25 by a chain 54 extending from the output shaft 12. The power is transmitted from the valve drive shaft 25 to the intake and exhaust camshafts 7 by a timing chain 55 and a chain type transmission means. The output shaft 12 is rotatably supported at both ends by bearings 28 and 29.