An airbag device for saddle-type vehicles including: an inflator; an airbag adapted to be expanded by gas discharged from the inflator; and a retainer accommodating the airbag, in which the inflator and the retainer are disposed as separate members. The retainer is provided on a turning axis of a handle stem in a side view of a vehicle, the inflator 53 provided around a head pipe in a top view of the vehicle, and the retainer and the inflator are coupled to each other with a connection tube.