A saddle-riding type vehicle, comprising: an engine which has a cylinder portion extending in a forward direction of the vehicle; an intake passage which extends from a rear side of the vehicle to a front side of the vehicle over the cylinder portion and is connected to the cylinder portion; a throttle valve which is provided in the intake passage, overlaps the cylinder portion in a plan view, and regulates an amount of intake air flowing through the intake passage; an engine member, the engine member being a chain tensioner for adjusting a tension of a timing chain in the engine, which is disposed on an upper surface of the cylinder portion and has a portion projecting upward; a throttle motor which drives the throttle valve and is disposed above the engine and below the intake passage; a speed reduction mechanism which is disposed on one side of the intake passage in a vehicle width direction and connects the throttle motor to the throttle valve so as to transmit power; and a sensor unit which is disposed on the other side of the intake passage in the vehicle width direction and is disposed outside the throttle motor in the vehicle width direction, characterized in that: a space is formed below the sensor unit and on a lateral side of the throttle motor in the vehicle width direction, the chain tensioner is disposed in the space, the saddle-riding type vehicle further includes a fastening member for fastening the chain tensioner to the upper surface of the cylinder portion; and in that at least a part of the fastening member overlaps the sensor unit in a plan view; and the throttle motor is disposed to avoid overlapping the chain tensioner in a plan view. an engine which has a cylinder portion extending in a forward direction of the vehicle; an intake passage which extends from a rear side of the vehicle to a front side of the vehicle over the cylinder portion and is connected to the cylinder portion; a throttle valve which is provided in the intake passage, overlaps the cylinder portion in a plan view, and regulates an amount of intake air flowing through the intake passage; an engine member, the engine member being a chain tensioner for adjusting a tension of a timing chain in the engine, which is disposed on an upper surface of the cylinder portion and has a portion projecting upward; a throttle motor which drives the throttle valve and is disposed above the engine and below the intake passage; a speed reduction mechanism which is disposed on one side of the intake passage in a vehicle width direction and connects the throttle motor to the throttle valve so as to transmit power; and a sensor unit which is disposed on the other side of the intake passage in the vehicle width direction and is disposed outside the throttle motor in the vehicle width direction, characterized in that: a space is formed below the sensor unit and on a lateral side of the throttle motor in the vehicle width direction, the chain tensioner is disposed in the space, the saddle-riding type vehicle further includes a fastening member for fastening the chain tensioner to the upper surface of the cylinder portion; and in that at least a part of the fastening member overlaps the sensor unit in a plan view; and the throttle motor is disposed to avoid overlapping the chain tensioner in a plan view. a space is formed below the sensor unit and on a lateral side of the throttle motor in the vehicle width direction, the chain tensioner is disposed in the space, the saddle-riding type vehicle further includes a fastening member for fastening the chain tensioner to the upper surface of the cylinder portion; and in that at least a part of the fastening member overlaps the sensor unit in a plan view; and the throttle motor is disposed to avoid overlapping the chain tensioner in a plan view.