Patent ID: 8695422

Claim:
A vehicular distance sensor apparatus to be attached to an attachment hole of a bumper of a vehicle to measure a distance from the vehicle to an obstacle, the vehicular distance sensor apparatus including: a sensor unit that transmits a transmission signal outward from the vehicle, the transmission signal hitting the obstacle and returning as a reflection signal, the sensor unit receiving the reflection signal; a case body that holds the sensor unit, the case body being to be attached to the attachment hole of the bumper of the vehicle; a bezel that has (i) a pipe portion fitted to the case body and (ii) a flange portion at one end portion in an axial direction of the pipe portion, the flange portion having an outer diameter larger than a hole diameter of the attachment hole; and a retainer that is made of resin material, the retainer being fitted to the pipe portion of the bezel, the retainer comprising: a basal portion being shaped of a ring; a plurality of arm portions extending in an axial direction from one end face of the basal portion; a plurality of pawl portions that are protrusions protruding from tip ends of the plurality of arm portions in a direction intersecting the axial direction, the protrusions having ridge top portions through which a circle is defined to pass, the circle having a diameter larger than the hole diameter of the attachment hole, the plurality of pawl portions being elastically deformed when the plurality of pawl portions are inserted into the attachment hole, the plurality of pawl portions being elastically restored to be engaged with an inner circumference edge of an exit side of the attachment hole in a state where the ridge top portions have passed through the attachment hole; and a stopper portion configured to be caught by the inner circumference edge of the exit side of the attachment hole when the plurality of pawl portions are elastically restored in the state where the ridge top portions have passed through the attachment hole, wherein: each of the pawl portions include a pair of pawl members, the pair of pawl members being engaged with the inner circumference edge of the exit side of the attachment hole in a state where the retainer is attached in the attachment hole of the bumper, the pair of pawl members being arranged to be V-shaped with a predetermined opening angle in a view in the axial direction, the pair of pawl members being elastically deformed so as to enlarge the opening angle when being inserted into the attachment hole; and the stopper portion is provided to be a protruding portion that is protruding outward from an opposing face of the pair of pawl members in the direction intersecting the axial direction of the retainer.