Engine unit of motorcycle

A plurality of cylinders (301) are disposed in parallel in a vehicle width direction, a clutch chamber is disposed in either one of the right and the left in the vehicle width direction, an intake manifold (54), a fuel injection device (502) , a throttle body (53), and an intake pipe (52) are disposed between a cylinder assembly (31) and an air cleaner (5) in an upper part of a crankcase assembly (32). The throttle body (53) is disposed on an opposite side in the vehicle width direction of the clutch chamber.