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A vehicular ultrasonic sensor apparatus serving as a distance sensor apparatus is equipped with a sensor unit, a case body, a bezel, and a retainer. The retainer includes a pair of pawl members. The pair of pawl members is equipped with a stopper portion. The ultrasonic sensor apparatus is inserted

A vehicular ultrasonic sensor apparatus serving as a distance sensor apparatus is equipped with a sensor unit, a case body, a bezel, and a retainer. The retainer includes a pair of pawl members. The pair of pawl members is equipped with a stopper portion. The ultrasonic sensor apparatus is inserted into an attachment hole of the bumper such that a connector portion of the case body is first inserted. When the retainer passes through the attachment hole, the pair of pawl members are elastically deformed. After passing through the attachment hole, the pair of pawl members are elastically restored, and the stopper portion is caught at an inner circumference edge of an exit side of the attachment hole.

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1. 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 transmissi

1. 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; anda 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; anda 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; andthe 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. 2. The vehicular distance sensor apparatus according to claim 1, wherein: a magnitude of a protrusion in the protruding portion of the stopper portion is defined as being from the opposing face of the pair of pawl members; andthe magnitude of the protrusion is decreased continuously as the protrusion approaches the basal portion of the retainer. 3. The vehicular distance sensor apparatus according to claim 1, wherein: the pawl member has a ridge line portion that is shaped to be a slope, the ridge line portion becoming higher continuously outward in the direction intersecting the axial direction, from a tip end portion of the pawl member in the axial direction to the ridge top portion. 4. The vehicular distance sensor apparatus according to claim 3, wherein: a board thickness of the bumper is provided such that the stopper portion is to be caught in the inner circumference edge of the exit side of the attachment hole in an attachment state that is a state where the vehicular distance sensor apparatus is attached in the bumper;when the board thickness is thinner than a predetermined value, (i) the pawl member is approximately in a standing state and (ii) the ridge line portion of the pawl member is digging in the inner circumference edge of the exit side of the attachment hole to be held in a state to prevent a dropout from the attachment hole; andwhen the board thickness is not thinner than the predetermined value, (i) the pawl member is approximately in a lying state and (ii) a force of elastic restoration acts on the inner circumference edge of the exit side of the attachment hole to be held in a state to prevent a dropout from the attachment hole. 5. The vehicular distance sensor apparatus according to claim 3, wherein: the hole diameter of the attachment hole of the bumper is provided such that the stopper portion is to be caught in the inner circumference edge of the exit side of the attachment hole in an attachment state that is a state where the vehicular distance sensor apparatus is attached in the bumper;when the hole diameter of the attachment hole is larger than a predetermined value, (i) the pawl member is approximately in a standing state and (ii) the ridge line portion of the pawl member is digging in the inner circumference edge of the exit side of the attachment hole to be held in a state to prevent a dropout from the attachment hole; andwhen the hole diameter of the attachment hole is not larger than the predetermined value, (i) the pawl member is approximately in a lying state and (ii) a force of elastic restoration acts on the inner circumference edge of the exit side of the attachment hole to be held in a state to prevent a dropout from the attachment hole. 6. A vehicular distance sensor apparatus that is attached to an attachment hole of a vehicle to measure a distance from the vehicle to an obstacle, the vehicular distance sensor apparatus comprising: 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; anda retainer that is made of resin material,the retainer being further configured to include:a basal portion shaped of a ring, the basal portion being fitted to the pipe portion of the basal portion;a plurality of arm portions extending from one end face of the basal portion in the axial direction of the ring of the basal portion; anda 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 plurality of pawl portions including ridge top portions through which a circle passes, the circle having a diameter larger than the hole diameter of the attachment hole, the plurality of pawl portions undergoing elastic deformation when being inserted into the attachment hole, the plurality of pawl portions undergoing elastic restoration after the ridge top portions pass through the attachment hole to be engaged with an inner circumference edge of an exit side of the attachment hole,wherein:a space gap is provided to be formed in between an inner circumference face of the arm portion of the retainer and an outer circumference face of the pipe portion of the bezel in a state where the basal portion of the retainer is fitted to the pipe portion of the bezel. 7. The vehicular distance sensor apparatus according to claim 6, wherein: a protruding portion is provided to be protruding from the outer circumference face of the pipe portion of the bezel; andthe inner circumference face of the arm portion abuts against the protruding portion on the outer circumference face of the bezel, forming the space gap. 8. The vehicular distance sensor apparatus according to claim 1, wherein a space gap is provided to be formed in between an inner circumference face of the arm portion of the retainer and an outer circumference face of the pipe portion of the bezel in a state where the basal portion of the retainer is fitted to the pipe portion of the bezel. 9. 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; anda 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; anda 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 a space gap is provided to be formed in between an inner circumference face of the arm portion of the retainer and an outer circumference face of the pipe portion of the bezel in a state where the basal portion of the retainer is fitted to the pipe portion of the bezel. 10. The vehicular distance sensor apparatus according to claim 9, wherein: the pawl portion includes 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; andthe 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. 11. The vehicular distance sensor apparatus according to claim 9, wherein the stop portion includes a generally flat surface that engages a first surface of the bumper immediately adjacent the attachment hole, the flange engaging a second surface of the bumper opposite to the first surface. 12. The vehicular distance sensor apparatus according to claim 11, wherein the generally flat surface is generally perpendicular to the axial direction of the retainer. 13. The vehicular distance sensor apparatus according to claim 1, wherein the stop portion includes a generally flat surface that engages a first surface of the bumper immediately adjacent the attachment hole, the flange engaging a second surface of the bumper opposite to the first surface. 14. The vehicular distance sensor apparatus according to claim 13, wherein the generally flat surface is generally perpendicular to the axial direction of the retainer.