Arrangement structure for sensor to be mounted to engine of vehicle

a a Disclosed is an arrangement structure for a sensor to be mounted to an engine of a vehicle, wherein the engine is arranged in an engine compartment of the vehicle in a posture allowing a crankshaft of the engine to be oriented in a widthwise direction of the vehicle. The arrangement structure comprises a driveshaft arranged along a vehicle-rearward lateral surface of the engine facing in a rearward direction of the vehicle, to rotatably drive a front wheel, and a flange section provided as a joining section between two members constituting the engine , to protrude in the rearward direction of the vehicle and at a height position below that of the driveshaft , wherein the sensor is mounted to the vehicle-rearward lateral surface of the engine at a height position located above the flange section and in overlapping relation with the driveshaft when viewed from a rear side of the vehicle. The arrangement structure of the present invention is capable of more reliably protecting the sensor mounted to the engine against foreign objects, such as water and a pebble, to adequately maintain performance of the sensor on a long-term basis.