An airbag device for pedestrian protection includes means for shrinking and tying an airbag after deployment toward the storage. The airbag device includes a protecting sheet that is folded together with the airbag and stored in the storage, and a wrapping sheet that wraps the airbag as folded. The protecting sheet includes a main body and a plurality of straps disposed in a periphery of the main body. The wrapping sheet includes a rupturable portion that is configured to rupture and split the wrapping sheet into a front portion and a rear portion at airbag deployment, and a plurality of through holes each for receiving the straps in a vicinity of the rupturable portion in the front portion. The deployed airbag is shrank and tied toward the storage by passing the straps through the through holes and tying them so the straps do not come off of the through holes.