Saddled vehicle with an airbag device comprising: a retainer provided behind a head pipe; an inflator; and an airbag accommodated in the retainer, the airbag being configured to be expanded by gas released by the inflator and deployed in front of a passenger, wherein the retainer has a box shape formed by assembling a plurality of components, the inflator is disposed to be offset outward in a vehicle width direction relative to the head pipe, wherein a first component covers the inflator from a vehicle front side, a second component is provided behind the head pipe, a third component is provided on a side of the passenger and is fitted to the second component and the first component from a back side, the first component includes an inflator support portion supporting the inflator, the first component and the second component are joined to form a front-side case, the third component is joined to the front-side case, the retainer has an L shape including: an upward/downward extending portion extending in an up-down direction and having an upper end portion from which the airbag is deployed; and a sideward extending portion extending outward in the vehicle width direction from the upward/downward extending portion, the front-side case in an L shape and the third component in an L shape are joined to each other, the upward/downward extending portion is located immediately behind the head pipe and is located at the center in the vehicle width direction, the sideward extending portion extends outward in the vehicle width direction and forward from the upward/downward extending portion, the first component constituting a front end portion of the sideward extending portion is located outward in the vehicle width direction relative to the head pipe and is located further forward than the head pipe in a vehicle side view, the inflator accommodated in the first component is located outward in the vehicle width direction relative to the head pipe and is located further forward than the head pipe in a vehicle side view. a retainer provided behind a head pipe; an inflator; and an airbag accommodated in the retainer, the airbag being configured to be expanded by gas released by the inflator and deployed in front of a passenger, wherein the retainer has a box shape formed by assembling a plurality of components, the inflator is disposed to be offset outward in a vehicle width direction relative to the head pipe, wherein a first component covers the inflator from a vehicle front side, a second component is provided behind the head pipe, a third component is provided on a side of the passenger and is fitted to the second component and the first component from a back side, the first component includes an inflator support portion supporting the inflator, the first component and the second component are joined to form a front-side case, the third component is joined to the front-side case, the retainer has an L shape including: an upward/downward extending portion extending in an up-down direction and having an upper end portion from which the airbag is deployed; and a sideward extending portion extending outward in the vehicle width direction from the upward/downward extending portion, the front-side case in an L shape and the third component in an L shape are joined to each other, the upward/downward extending portion is located immediately behind the head pipe and is located at the center in the vehicle width direction, the sideward extending portion extends outward in the vehicle width direction and forward from the upward/downward extending portion, the first component constituting a front end portion of the sideward extending portion is located outward in the vehicle width direction relative to the head pipe and is located further forward than the head pipe in a vehicle side view, the inflator accommodated in the first component is located outward in the vehicle width direction relative to the head pipe and is located further forward than the head pipe in a vehicle side view.