A sensor for a vehicle 1 is provided with a sensor element, plurality of lead wires electrically connected to the sensor element, a metallic cylindrical cover and a rubber bush positioned in a partial inner-space of a base end of the cylindrical cover. Radial contraction of the cylindrical cover and compression of bush, deforming the bush radially inward thereof, supports the leads wires inserted through each of the respective through-holes. The cylindrical cover is provided with a curved portion having a base end of which a whole circumferential edge is bent radially inward, thereby producing the curved portion opposing a rim of the bush in an axial direction.