An airbag device for a passenger seat having an inflator and an airbag, wherein: the airbag includes a first structural portion that structures a left-right direction intermediate portion of the airbag and at which is formed a first surface, and second structural portions that are formed in continuation with both left and right sides of the first structural portion and at which are formed a pair of respective second surfaces that is to bulge further toward the front passenger seat side than the first surface and move apart from one another, and a connecting cloth, which connects regions that become bulging end portion sides of the pair of second surfaces in an inflated and deployed state of the airbag, and which is deployed to cover a range that is reached by the head portion and the chest portion of the passenger in the front passenger seat, is provided.