JP2001138850A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device capable of facilitating manufacture of a bag holder. SOLUTION: In this air bag device 10 for a front passenger seat 16, the bag holder 26 for holding a bag 40 for binding an occupant is so constructed that in addition to a bottom wall 28, a pair of side walls 30 projected upward opposite to each other are continuously provided on the peripheral edge of the bottom wall 28. Accordingly, unlike the conventional bag holder like a box with an upper surface opened, in manufacturing the bag holder 26, a drawing process is not needed, progressive forming is applicable, it is not always necessary to use a material having good extensibility for the bag holder 26, and the manufacturing of the bag holder 26 can be facilitated. The shape of the bag holder 26 can be simplified, the bag holder 26 can be reduced in size, the yield of the bag holder 26 can be improved, and the bag holder 26 can be reduced in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device for a front passenger seat provided in front of a front passenger seat of a vehicle.

[0002]

2. Description of the Related Art An airbag device for a passenger seat of a vehicle includes, for example, a metal bag holder, and the bag holder is fixed in an instrument panel in front of a passenger seat. The bag holder is formed in a box shape with an open top surface (upper wall surface of the vehicle) and has four side walls in addition to a bottom wall. A bag body for restraining an occupant is stored in the bag holder. And are retained. An inflator is fixed to the bag holder, and when the vehicle suddenly decelerates, the inflator generates gas to expand the bag. Also, the instrument panel is provided with a cover corresponding to the bag, the burst line formed on the cover is broken by the bag that expands when the vehicle suddenly decelerates,
In this configuration, the door provided on the cover is expanded and the bag is expanded toward the occupant in the passenger seat.

In this airbag device, the bag body is surrounded by the four side walls of the bag holder without gaps in four directions, so that when the bag body is inflated (when the vehicle is suddenly decelerated). The four side walls of the bag holder allow the bag to be reliably inflated toward the cover.

[0004] A fixed cylinder is formed on the cover corresponding to the bag holder, and the cover is held by the bag holder by fixing the fixed cylinder to the bag holder. Therefore, when the vehicle suddenly decelerates, the portion of the cover facing the bag body (the portion provided with the fixed cylinder) is fixed and the portion facing the cover bag body (the portion provided with the fixed cylinder) is fixed. (Inside), the pressure of the expanding bag acts, so that the burst pressure of the cover can reliably break the burst line of the cover.

[0005] Further, when the vehicle suddenly decelerates, the burst line of the cover is broken and the door portion of the cover, which is deployed, can be held by the bag holder via the fixed cylinder, whereby the door portion of the cover is detached from the airbag device. Can be prevented.

However, in such an airbag device, as described above, since the shape of the metal bag holder is a box shape having an open upper surface, when manufacturing (working) the bag holder, A drawing step is required, the progressive feeding cannot be performed, and a material having good extensibility must be used for the bag holder. Therefore, there is a problem that it is difficult to manufacture (work) the bag holder.

Further, since the bag holder is formed in a box shape having an open upper surface and is provided with four side walls in addition to the bottom wall, the shape of the bag holder becomes complicated, and the size of the bag holder increases. There is also a problem that the yield of the holder decreases and the weight of the bag holder increases.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide an airbag apparatus which can easily manufacture (work) a bag holder in consideration of the above fact.

[0009]

An airbag device according to claim 1 is provided in an instrument panel in front of a passenger seat of a vehicle, is provided continuously with a bottom wall and a peripheral edge of the bottom wall, and protrudes upward. A bag holder having a pair of side walls facing each other, a pair of open surfaces being formed at a portion where the side walls are not provided above the bottom wall peripheral edge, and having a generally U-shaped cross section with an open top as a whole. And a bag for restraining an occupant held by the bag holder between the pair of side walls and expanding when the vehicle suddenly decelerates, and provided on the instrument panel corresponding to the bag and on the pair of side walls. Correspondingly, a pair of fixed legs are provided, the pair of fixed legs are fixed to the pair of side walls, and have a deployable door portion and a thin portion provided with a thin peripheral edge of the door portion. , Vehicle steep And a, and a cover to allow deployment of the occupant side of the passenger seat of the bag by the door portion and the thin portion is broken is expanded by the bag to expand when fast.

[0010] In the airbag device according to the first aspect, a bag holder having an open upper portion is provided in an instrument panel in front of a passenger seat of the vehicle, and a bag body for restraining an occupant held by the bag holder is provided. By expanding when the vehicle suddenly decelerates, the broken portion of the cover provided on the instrument panel is broken by the bag and the door portion of the cover is expanded, whereby the bag is expanded to the passenger side of the passenger seat. You.

[0011] According to the airbag device of the first aspect, the bag holder has a pair of side walls protruding upward and facing each other in addition to the bottom wall, continuously provided on the periphery of the bottom wall. A pair of open surfaces is formed at a portion where the side wall on the upper side of the bottom wall peripheral edge is not provided, so that the overall configuration is a U-shaped cross section with an open top. Therefore, the bag holder has a shape in which only a pair (two) of side walls are bent with respect to the bottom wall. Therefore, unlike the conventional bag holder having a box shape with an open upper surface, the bag holder is not used. When manufacturing (working), the drawing step becomes unnecessary, and the progressive feeding becomes possible, and it is not always necessary to use a material having good extensibility for the bag holder. Therefore, manufacture (processing) of the bag holder can be facilitated.

Further, since the bag holder has only one pair (two) of side walls in addition to the bottom wall, the shape of the bag holder can be simplified, the size of the bag holder can be reduced, and the yield of the bag holder can be reduced. The weight of the bag holder can be reduced while the weight can be improved.

Here, the pair of fixing legs of the cover are fixed to the pair of side walls of the bag holder, respectively, whereby the cover is fixed to the bag holder. Therefore, even when the instrument panel and the cover are separated from each other, it is possible to prevent the cover from dropping off the instrument panel.

Further, since the bag is held between the pair of side walls as described above, the pair of fixed legs respectively fixed to the pair of side walls face each other with the bag interposed therebetween.
Thus, at the time of rapid deceleration of the vehicle, a portion (a pair of fixed legs) of the cover facing the bag with both ends (two portions provided with the fixed legs) of the portion facing the bag fixed. Since the pressure of the inflating bag acts during the interval, the thin portion of the cover can be reliably broken by the pressure of the bag even when the instrument panel and the cover are separately provided.

Further, since the pair of fixed legs of the cover are fixed to the pair of side walls, the cover portion which is opened when the thin portion of the cover is broken by the bag expanding when the vehicle suddenly decelerates. Can be held by the side wall of the bag holder, and therefore, even when the instrument panel and the cover are separated from each other, it is possible to prevent the door from being detached from the airbag device.

According to a second aspect of the present invention, in the airbag apparatus according to the first aspect, the pair of side walls face each other in a direction in which the door is deployed.

In the airbag device according to the present invention, since the pair of side walls of the bag holder face each other in the direction in which the door portion of the cover is deployed, the pair of side walls provided on the cover correspond to the pair of side walls. The fixed legs also oppose each other in the direction in which the door portion of the cover is deployed. For this reason, even if the thin portion of the cover is broken during rapid deceleration of the vehicle, the opened door portion of the cover does not separate from the pair of fixed legs and is always integrated, and as described above, the pair of fixed legs Are fixed to a pair of side walls of the bag holder, respectively.
Therefore, when the vehicle is suddenly decelerated, the pair of side walls of the bag holder can securely hold the door portion through the pair of fixed legs. Therefore, even when the instrument panel and the cover are separated from each other, the cover of the cover can be particularly improved. It is possible to reliably prevent the door from being detached from the airbag device.

According to a third aspect of the present invention, there is provided the airbag apparatus according to the first or second aspect.
The instrument panel or cover is provided so as to correspond to the pair of open surfaces, and includes a pair of resistance walls arranged so as to face the pair of open surfaces.

In the airbag device according to the third aspect, a pair of resistance walls are respectively arranged on the pair of open surfaces of the bag holder so as to face each other. The periphery is surrounded from four directions by being surrounded by a pair of resistance walls. For this reason, the bag body can be prevented from being displaced from between the pair of side walls and moved to the outside of the open surface of the bag holder or the like by the pair of side walls and the pair of resistance walls. Thus, the bag body can be reliably disposed between the pair of side walls of the bag holder, and the bag body can be reliably inflated toward the cover by the pair of resistance walls and the pair of side walls when the vehicle is rapidly decelerated. In addition, the function of deploying the bag can be favorably maintained.

According to a fourth aspect of the present invention, there is provided the airbag apparatus according to the third aspect, further comprising a reinforcing member bridged between the pair of resistance walls.

In the airbag device according to the fourth aspect, since the reinforcing member is bridged between the pair of resistance walls, the resistance walls can be reinforced by the reinforcing members. For this reason, even if strong pressure acts on the resistance wall due to the bag body that expands during rapid deceleration of the vehicle, it is possible to prevent the resistance wall from being damaged, and thereby it is possible to maintain the deployment function of the bag body better. it can.

[0022]

FIG. 1 is a perspective view showing an airbag device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing the airbag device 10 and the airbag device 10 provided therein. The instrument panel 12 shown is shown in cross section. FIG. 3 is an exploded perspective view of the airbag device 10 and the instrument panel 12, and FIG. 4 is a diagram of a vehicle 14 including the airbag device 10 and the instrument panel 12. The room is shown in a perspective view.

A rectangular opening 18 is formed in the instrument panel 12 in front of the passenger seat 16 of the vehicle 14, and the opening 18 partially opens the instrument panel 12 above the vehicle 14. . A contact wall 20 is formed on the inner peripheral edge of the opening 18, and the contact wall 20 biases the instrument panel 12 around the opening 18 toward the inside of the instrument panel 12.

The inner peripheral edge of the contact wall 20 is provided with a pair of resistance walls 2.
2 are formed. The pair of resistance walls 22 correspond to a pair of open surfaces 32 of the bag holder 26 described later.
2 and perpendicular to 2. Further, a pair of reinforcing walls 24 as reinforcing members are formed on the inner peripheral edge of the contact wall 20, and the pair of reinforcing walls 24 face each other in the front-rear direction of the vehicle 14, and the instrument around the opening 18. It is perpendicular to the panel 12. The reinforcing wall 24 is bridged between the pair of resistance walls 22,
Thus, the resistance wall 22 is reinforced by the reinforcing wall 24.

The airbag device 10 according to the present embodiment
Is provided in the opening 18 of the instrument panel 12. The airbag device 10 includes a metal bag holder 26. The bag holder 26 has a rectangular bottom wall 28, and a pair of side walls 30 projecting upward and facing each other are provided continuously to the periphery of the bottom wall 28, and the side wall 30 on the upper side of the periphery of the bottom wall 28 is provided. By forming a pair of open surfaces 32 at a portion where is not provided, the whole is configured to have a U-shaped cross section with an open upper portion. The pair of side walls 30 face each other in the vehicle 14 front-back direction,
The pair of open surfaces 32 face each other in the width direction of the vehicle 14. A stay (not shown) is fixed to the bag holder 26, and the stay is fixed to a bracket (not shown) of a reinforcement (not shown) provided in the instrument panel 12, whereby the bag holder 2 is fixed.
6 is fixed in the instrument panel 12.
The pair of resistance walls 22 described above are disposed on the pair of open surfaces 32 so as to face each other with substantially no gap.

A substantially cylindrical inflator 34 is fixed to the bottom wall 28 of the bag holder 26. A portion of the inflator 34 above the vehicle 14 (hereinafter, referred to as a “spout portion 36”) projects above the vehicle 14 from the bottom wall 28, whereby the spout portion 36 is disposed between the pair of side walls 30. In addition, a plurality of gas holes 38 are provided in the ejection portion 36, and the inflator 34 ejects (generates) a large amount of gas from the gas holes 38 when the vehicle 14 suddenly decelerates.

An occupant restraining bag 40 is held on the bottom wall 28 of the bag holder 26. The bag 40 is folded between a pair of side walls 30 of the bag holder 26, and the ejection portion 36 of the inflator 34 is inserted into the bag 40 from an opening 40 </ b> A. Thus, when the vehicle 14 is suddenly decelerated, the bag 40 is inflated by the gas generated from the inflator 34.

A cover 42 is provided above the bag 40 on the vehicle 14.
Are provided corresponding to the bag body 40. The cover 42
The rectangular fracture plate 44 and the bag holder 2
It is constituted by a pair of fixed legs 46 projecting to the 6 side. The cover 42 is separate from the instrument panel 12, and the breaking plate 44 is
The instrument panel 12 is fitted into the opening 18 of the instrument panel 12 in contact with the contact wall 20. A pair of fixed legs 4
Reference numeral 6 denotes a pair of fixed legs 46 that face the pair of side walls 30 of the bag holder 26 in the front-rear direction of the vehicle 14.
Are fixed to the pair of side walls 30, respectively, so that the cover 42 is fixed to the bag holder 26. In addition, since the bag 40 is held between the pair of side walls 30 by the bag holder 26 as described above, the pair of fixed legs 46 also face each other with the bag 40 interposed therebetween.

A door 44A is provided on a break plate 44 of the cover 42, and the door 44A can be deployed in the front-rear direction of the vehicle 14. A predetermined portion of the breaking plate 44 (the door 44
A burst line 48 as a thin portion is formed on the peripheral edge of A).
And has a predetermined shape (H-shape in the present embodiment). Here, as described above, when pressure is applied to the rupture plate 44 by the bag body 40 that expands when the vehicle 14 suddenly decelerates, the burst line 48 of the cover 42 (the rupture plate 44) is broken, and the door portion 44 of the rupture plate 44 is broken.
When A is deployed, the bag body 40 is deployed to the passenger side of the passenger seat 16.

Next, the operation of the present embodiment will be described.

In the airbag device 10 having the above structure, the instrument panel 12 in front of the passenger seat 16 of the vehicle 14 is provided.
A bag holder 26 having an opening at the top is provided therein, and the occupant restraining bag body 4 held by the bag holder 26 is provided.
When 0 expands when the vehicle 14 suddenly decelerates, the burst line 48 of the cover 42 (breaking plate 44) provided on the instrument panel 12 is broken by the bag body 40, and the door portion 44 </ b> A of the breaking plate 44 expands. , Thereby, the bag 4
0 is deployed to the passenger side of the passenger seat 16.

Here, according to the airbag device 10, the bag holder 26 is provided with a pair of side walls 30 projecting upward and facing each other in addition to the bottom wall 28 so as to be continuous with the periphery of the bottom wall 28. By forming a pair of open surfaces 32 at a portion where the side wall 30 on the upper side of the bottom wall 28 is not provided,
The whole is configured to have a U-shaped cross section with an open upper part. Therefore, the bag holder 26 has a shape in which only a pair (two) of the side walls 30 are bent with respect to the bottom wall 28, and thus differs from a conventional bag holder having a box shape with an open upper surface. When the bag holder 26 is manufactured (processed), the drawing process is not required, and the bag holder 26 can be fed progressively. In addition, it is not always necessary to use a material having good extensibility for the bag holder 26. Therefore, manufacturing (working) of the bag holder 26 can be facilitated.

Further, since the bag holder 26 has only a pair (two) of side walls 30 in addition to the bottom wall 28, the shape of the bag holder 26 is simplified, and the size of the bag holder 26 can be reduced. The yield of the holder 26 can be improved and the weight of the bag holder 26 can be reduced.

Here, since the pair of resistance walls 22 are disposed on the pair of open surfaces 32 of the bag holder 26 so as to oppose each other with substantially no gap, the bag body 40 is attached to the bag holder 2.
The periphery is surrounded by the pair of resistance walls 22 in addition to the pair of side walls 30 of FIG. Therefore, the pair of side walls 30 and the pair of resistance walls 22 can prevent the bag body 40 from being displaced from between the pair of side walls 30 and moving to the outside of the open surface 32 of the bag holder. As a result, the bag 40 can be reliably disposed between the pair of side walls 30 of the bag holder 26, and the bag 40 can be reliably moved toward the cover 42 by the pair of resistance walls 22 and the pair of side walls 30 during rapid deceleration of the vehicle. The bag 40 can be inflated, so that the bag 40 can maintain its deployment function well.

Further, since the reinforcing wall 24 is bridged between the pair of resistance walls 22, the resistance wall 22 can be reinforced by the reinforcing wall 24. For this reason, even if a strong pressure acts on the resistance wall 22 by the bag body 40 which expands when the vehicle 14 suddenly decelerates, the resistance wall 22 can be prevented from being damaged, and thus the function of deploying the bag body 40 is further improved. Can be maintained.

Here, the pair of fixing legs 46 of the cover 42 are fixed to the pair of side walls 30 of the bag holder 26, respectively, whereby the cover 42 is fixed to the bag holder 26. Therefore, even when instrument panel 12 and cover 42 are separated as in the present embodiment, it is possible to prevent cover 42 from falling off instrument panel 12.

As described above, the bag 40 is formed by a pair of side walls 3.
The pair of fixed legs 46 fixed to the pair of side walls 30 are opposed to each other with the bag body 40 interposed therebetween because they are held between zero. Thus, when the vehicle 14 suddenly decelerates, both ends of the portion of the cover 42 facing the bag 40 (two portions provided with the fixing legs 46) are opposed to the bag 40 of the cover 42 in a fixed state. Since the pressure of the expanding bag body 40 acts on the portion (between the pair of fixed legs 46),
In particular, even when the instrument panel 12 and the cover 42 are separated as in the present embodiment, the burst line 48 of the cover 42 can be reliably broken by the pressure of the bag 40.

Further, since the pair of fixed legs 46 of the cover 42 are fixed to the pair of side walls 30, respectively, the vehicle 1
When the burst line 48 of the cover 42 is broken by the bag body 40 that expands when the vehicle 4 suddenly decelerates, the door portion 44A of the cover 42 that is deployed can be held by the side wall 30 of the bag holder 26. Even when the instrument panel 12 and the cover 42 are separated from each other as described above, it is possible to prevent the door portion 44A from being detached from the airbag device 10.

Further, the pair of side walls 30 of the bag holder 26 face each other in the direction in which the door portion 44A of the cover 42 is deployed (in the present embodiment, the vehicle front-rear direction). The pair of fixed legs 46 provided on the cover 42 also face each other in the direction in which the door 44A of the cover 42 is deployed. For this reason, even if the burst line 48 of the cover 42 is broken at the time of rapid deceleration of the vehicle 14, the door 44 </ b> A of the spread cover 42 is always separated from the pair of fixed legs 46 without being separated from the pair of fixed legs 46.
Moreover, the pair of fixed legs 46 are fixed to the pair of side walls 30 of the bag holder 26, respectively, as described above. Therefore, when the vehicle suddenly decelerates, the pair of side walls 30 of the bag holder 26 can securely hold the door portion 44A via the pair of fixed legs 46. Therefore, the instrument panel 12 and the cover 42 are particularly provided as in the present embodiment. Even if they are separated from each other, it is possible to reliably prevent the door portion 44A of the cover 42 from being detached from the airbag device 10.

In the present embodiment, the instrument panel 12 and the cover 42 are configured separately from each other. However, the instrument panel 12 and the cover 42 may be integrated.

Further, in the present embodiment, the pair of resistance walls 22 are provided on the instrument panel 12, but the pair of resistance walls may be provided on the cover.

Further, in this embodiment, the pair of side walls 30 of the bag holder 26 face each other in the longitudinal direction of the vehicle 14, but the pair of side walls of the bag holder face each other in the vehicle width direction. Is also good.

In the present embodiment, the burst line 48 of the cover 42 is formed in an H shape, but the burst line of the cover may be formed in a U shape or a single shape.

Further, in this embodiment, the reinforcing wall 24 as a reinforcing member is bridged between the pair of resistance walls 22 to reinforce the resistance walls 22, but the airbag according to the modification shown in FIG. Like the device 80, a pair of reinforcing ribs 82 (resin-made ones,
A metal structure may be provided instead of the reinforcing wall 24 or together with the reinforcing wall 24 to reinforce the resistance wall 22.

[0045]

According to the airbag device of the first aspect, the bag holder has a shape in which only one pair (two) of side walls are bent with respect to the bottom wall. During the processing, the drawing step is not required and the progressive feeding becomes possible, and it is not always necessary to use a material having good extensibility for the bag holder. Therefore, the manufacturing (processing) of the bag holder can be facilitated. .

Further, since the bag holder has only one pair (two) of side walls in addition to the bottom wall, the shape of the bag holder can be simplified, the size of the bag holder can be reduced, and the yield of the bag holder can be reduced. The weight of the bag holder can be reduced while the weight can be improved.

Here, the pair of fixing legs of the cover are fixed to the pair of side walls of the bag holder, respectively.
Even when the instrument panel and the cover are separated from each other, it is possible to prevent the cover from dropping off the instrument panel.

Also, when the vehicle is suddenly decelerated, the pressure of the inflating bag acts on the portion of the cover facing the bag while the both ends of the portion facing the bag are fixed. Even when the panel and the cover are separated from each other, the thin portion of the cover can be reliably broken by the pressure of the bag.

Further, since the pair of fixing legs of the cover are fixed to the pair of side walls, the door portion of the cover is detached from the airbag device even when the instrument panel and the cover are separately provided. Can be prevented.

In the airbag device according to the second aspect, the pair of side walls of the bag holder oppose each other in the direction in which the door portion of the cover is deployed, so that the pair of side walls provided on the cover correspond to the pair of side walls. The fixed legs also oppose each other in the direction in which the door portion of the cover is deployed. Therefore,
When the vehicle is suddenly decelerated, the pair of side walls of the bag holder can securely hold the door via the pair of fixed legs. Therefore, even when the instrument panel and the cover are separated from each other, the door portion of the cover can be used. Can reliably be prevented from separating from the airbag device.

In the airbag device according to the third aspect, since the pair of resistance walls are disposed opposite to each other on the pair of open surfaces of the bag holder, the bag body can be securely inserted between the pair of side walls of the bag holder. When the vehicle is suddenly decelerated, the pair of resistance walls and the pair of side walls can reliably inflate the bag body toward the cover, so that the function of deploying the bag body can be favorably maintained.

In the airbag device according to the fourth aspect, since the reinforcing member is bridged between the pair of resistance walls and the reinforcing members can be reinforced by the reinforcing members, the resistance walls can be prevented from being damaged. Thereby, the deployment function of the bag body can be more favorably maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an airbag device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an airbag device according to an embodiment of the present invention and an instrument panel provided with the airbag device.

FIG. 3 is an exploded perspective view showing an airbag device according to the embodiment of the present invention and an instrument panel provided with the airbag device.

FIG. 4 is a perspective view showing the interior of a vehicle including an airbag device according to the embodiment of the present invention and an instrument panel provided with the airbag device.

FIG. 5 is a cross-sectional view showing an airbag device according to a modification of the present embodiment and an instrument panel provided with the airbag device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Airbag apparatus 12 Instrument panel 14 Vehicle 16 Passenger's seat 22 Resistance wall 24 Reinforcement wall (reinforcement member) 26 Bag holder 28 Bottom wall 30 Side wall 32 Open surface 40 Bag body 42 Cover 44A Door part 46 Fixed leg 48 Burst line (thin wall) Part)

Claims (4)

[Claims] 1. A bottom wall provided in an instrument panel in front of a passenger seat of a vehicle, the bottom wall having a bottom wall and a pair of side walls provided continuously with a peripheral edge of the bottom wall and projecting upward and facing each other. A pair of open surfaces are formed in a portion where the side walls are not provided on the peripheral upper side, and a bag holder configured to have a generally U-shaped cross section with an upper part opened as a whole, held by the bag holder between the pair of side walls, An occupant restraining bag that expands when the vehicle is suddenly decelerated; and a pair of fixed legs provided on the instrument panel corresponding to the bag and provided on the instrument panel corresponding to the pair of side walls. A leg fixed to the pair of side walls and having a deployable door portion and a thin portion provided with a thin peripheral edge of the door portion, wherein the thin portion is expanded by the bag body which expands when the vehicle is rapidly decelerated. Breaks Airbag apparatus provided with a cover which enables the deployment to the occupant side of the passenger seat of the bag by the door portion is expanded is. 2. The airbag device according to claim 1, wherein the pair of side walls face each other in a direction in which the door portion is deployed. 3. The apparatus according to claim 1, further comprising a pair of resistance walls provided on the instrument panel or the cover corresponding to the pair of open surfaces, and disposed opposite to the pair of open surfaces. The airbag device according to claim 1 or 2. 4. The airbag device according to claim 3, further comprising a reinforcing member bridged between the pair of resistance walls.