To prevent relaxation of an axis adjustment member, while sustaining the operability of the axis adjustment member of a mobile body mounting apparatus.

The rotation of a bolt member 20 due to vibration or the like is limited, by engaging a nail part 33d of a displacement limiting member 33 energized by a torsion spring 35 with a tooth-like part 20c provided at the head part 20b of the bolt member 20 for adjusting the axis of a radar apparatus, and the shift of the axis of the radar apparatus is prevented. When the displacement limiting member 33 is pressed by a jig 28 so as to be oscillated around a pivot 34, in order to adjust the axis of the radar apparatus, the tip 28a of the jig 28 is engaged with the tooth-like part 20c of the bolt member 20, and the bolt member 20 can be rotated by the jig 28, in which a support part 33c of the displacement limiting member 33 abuts against and supports the tip 28a of the jig 28. Accordingly, the operability of the jig 28 is improved and the adjustment work for the axis is facilitated.

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