An airbag attachment structure including an airbag supporting bracket (23), the airbag supporting bracket (23) including: the guide/reinforcement member (33) configured to carry both the guide function of the guide portion (G) and the reinforcement function of the reinforcement portion (R), and cover the circumference of the opening portion (28) of the airbag module (21), leaving an uncovered portion thereon; the partial guide member (34) configured to carry only the guide function of the guide portion (G), which is attached to the uncovered portion; and the partial reinforcement member (35) configured to carry only the reinforcement function of the reinforcement portion (R), which covers the partial guide member (34) from an outside thereof.