A power unit for a vehicle includes an engine that is a power source, a gear shift apparatus, a twin clutch type transmission that intermittently switches power transmission between the engine and the gear shift apparatus, and a clutch actuator that controls intermittent switching of the twin clutch type transmission, the engine includes a crankcase and a pair of cylinders installed on the crankcase so that a V-bank is formed therebetween, and the clutch actuator is installed on the cylinders so that the clutch actuator overlaps a region of the V-bank.