<p>In an attachment structure, a vehicle-mounted electronic device is attached to a receiving box using an adjusting member for adjusting a difference between an external dimension of the electronic device and a dimension of a receiving space of the receiving box for receiving the electronic device. The adjusting member has an insertion-coupling device for insertion-coupling the adjusting member and the electronic device, and a first catch-coupling device for catch-coupling the adjusting member and the receiving box. The first catch-coupling device is an appended claw-receiving part that corresponds to a flexible claw on the receiving box, and the direction of insertion-coupling of the insertion-coupling device and the direction of catch-coupling of the first catch-coupling device are different.</p>
