An attachment clip 10 is provided to attach a heat shielding plate 4 to an under-panel 2. The under-panel 2 has a bolt 5 projecting from a floor tunnel 2a. The heat shielding plate 4 has a bolt hole 4a formed to allow passage of a shank 5a of the bolt 5. The attachment clip 10 has a clip body 11 having an abutting part 13 for abutment on the heat shielding plate 4. The abutting part 13 has a shank hole 12 for passage of the shank 5a of the bolt 5. The attachment clip 10 further includes six engagement claws 10A-10F projecting from the inner periphery of the clip body 11 inwardly. The engagement claws 10A-10F have respective engagement tips 10a-10f formed to depart from the clip body 11 along the axial direction of the attachment chip 10, providing a substantial cone-shaped configuration. The engagement claws 10A-10F elastically engage with threads of the shank 5a while urging the heat shielding plate 4 toward the under-panel 2 along the axial direction of the bolt 5.