Far side airbag device for vehicle

1. A far side airbag device for a vehicle, comprising:

an inflator that is provided at a vehicle transverse direction central-side side portion of a seat back along a height direction of the seat back, and that jets gas out from a jetting portion that is provided at a gas supplying end portion at an upper end side of the inflator;

a side airbag that is provided at the vehicle transverse direction central-side side portion, has an interior that houses the inflator, receives a supply of gas from the inflator and is thereby inflated and expanded, and covers, from a vehicle transverse direction central side, at least a region from a chest portion to a head portion of a vehicle occupant;

a diffuser that is housed at the interior of the side airbag, and that receives a supply of gas from the inflator and is thereby inflated and expanded in a shape of a tube that surrounds the inflator; and

a protecting portion that covers the gas supplying end portion in a state in which the side airbag and the diffuser are inflated and expanded,

wherein the protecting portion includes a protecting patch that is provided along the diffuser, is inflated and expanded together with the diffuser, and covers the gas supplying end portion.

2. The far side airbag device for a vehicle of claim 1 , wherein the protecting patch is provided at an inner peripheral surface of the diffuser.

3. The far side airbag device for a vehicle of claim 1 , wherein the protecting portion includes a protecting cap that is put on the gas supplying end portion and that has an opening through which gas passes.

4. The far side airbag device for a vehicle of claim 3 , wherein the protecting cap is mounted to the gas supplying end portion in a state in which a gap is formed between the protecting cap and the gas supplying end portion.

5. The far side airbag device for a vehicle of claim 3 , wherein the opening is formed in an upper surface of the protecting cap.

6. The far side airbag device for a vehicle of claim 3 , wherein an upper edge portion of the protecting cap is chamfered into a curved surface.

7. A far side airbag device for a vehicle, comprising:

an inflator that is provided at a vehicle transverse direction central-side side portion of a seat back along a height direction of the seat back, and that jets gas out from a jetting portion that is provided at a gas supplying end portion at an upper end side of the inflator;

a side airbag that is provided at the vehicle transverse direction central-side side portion, has an interior that houses the inflator, receives a supply of gas from the inflator and is thereby inflated and expanded, and covers, from a vehicle transverse direction central side, at least a region from a chest portion to a head portion of a vehicle occupant;

a diffuser that is housed at the interior of the side airbag, and that receives a supply of gas from the inflator and is thereby inflated and expanded in a shape of a tube that surrounds the inflator; and

a protecting portion that covers the gas supplying end portion in a state in which the side airbag and the diffuser are inflated and expanded,

wherein the protecting portion includes a back board side portion of a seat back board that circles around from a back surface side of the seat back toward a vehicle transverse direction central side of the gas supplying end portion.

8. The far side airbag device for a vehicle of claim 7 , wherein the back board side portion covers the inflator from a vehicle transverse direction central side and over an entire length of the inflator in a length direction of the inflator.

9. The far side airbag device for a vehicle of claim 1 , wherein

the inflator has an inflator main body portion that extends along a height direction of the seat back,

the jetting portion has jetting holes that jet gas out, and the jetting portion projects out in a shape of a protrusion from an upper surface of the inflator main body portion, and forms a step portion between the jetting portion and the inflator main body portion, and

the gas supplying end portion includes the jetting portion and the step portion.

10. A far side airbag device for a vehicle, comprising:

an inflator that is provided at a vehicle transverse direction central-side side portion of a seat back along a height direction of the seat back, and that jets gas out from a jetting portion that is provided at a gas supplying end portion at an upper end side of the inflator;

a side airbag that is provided at the vehicle transverse direction central-side side portion, has an interior that houses the inflator, and receives a supply of gas from the inflator and is thereby inflated and expanded;

a diffuser that is housed at the interior of the side airbag, and that receives a supply of gas from the inflator and is thereby inflated and expanded in a shape of a tube that surrounds the inflator; and

a protecting portion that is formed at the gas supplying end portion, and at which an angled edge of the gas supplying end portion is chamfered into a curved surface,

wherein the protecting portion includes a protecting patch that is provided along the diffuser, is inflated and expanded together with the diffuser, and covers the gas supplying end portion.

11. The far side airbag device for a vehicle of claim 10 , wherein

the inflator has an inflator main body portion that extends along a height direction of the seat back,

the jetting portion has jetting holes that jet gas out, and the jetting portion projects out in a shape of a protrusion from an upper surface of the inflator main body portion, and forms a step portion between the jetting portion the inflator main body portion,

the gas supplying end portion includes the jetting portion and the step portion, and

the protecting portion is formed respectively at an upper edge portion of the jetting portion and at the step portion.