There is provided a saddle-riding type small vehicle where a power unit is mounted on a vehicle body frame. The power unit includes a valve control device that controls the operation of valve-operation mode changing mechanisms capable of changing operation modes of engine valves, and a clutch control device that controls the operation of a clutch unit provided between a crankshaft and a shift mechanism so as to shift the connection/disconnection of power transmission. In the vehicle, the valve control device and the clutch control device are disposed to balance the center of gravity, so as to make a power unit compact. A valve control device and a clutch control device are disposed on left and right sides of a center line CB of a vehicle in a width direction of the vehicle.