A wearable airbag device for protecting the hip of a wearer from the surface they hit at fall includes an airbag that is adapted to be worn around the pelvis and inflatable with an inflation gas. The airbag includes two covering portions that are configured to cover outer sides of left and right trochanters of femurs of the wearer respectively at airbag deployment, and a means for suppressing an elevation of an internal pressure of the airbag at contact between the airbag and the surface at fall of the wearer.