JPH1086772A - Vehicular airbag device, airbag and folding method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular airbag device formed by folding an airbag whose both walls are connected at each connection part and formed in a bag shape and also formed by that each connection part is positioned in an inner side, so that its thickness is not increased as much as possible and an airbag and the folding method thereof. SOLUTION: Out of the outer periphery edge of an airbag main body 10, both outer periphery edges P2, P3 positioned in both sides of an outer periphery edge P1 along with both ends of an opposite outer periphery edge P4 for the outer periphery edge P1 are folded in the slant direction to the center line Q side so as not to duplicate each other as both inside folded parts D1, D2 to the inside of the airbag main body 10 based on folding lines H1, H2. Thereby, the increase of the folded thickness of the airbag can be restrained to the minimum and the airbag is stored easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an airbag device mounted on a vehicle, an airbag, and a method of folding the airbag.

[0002]

2. Description of the Related Art Conventionally, when an airbag device of a vehicle is stored in a storage portion of the vehicle, for example, as shown in FIGS. It is usual that the peripheral portions 3, 4 are folded outward in the direction of arrow a from the outside toward the other side.

[0003]

However, in such an airbag device, the upper wall 1 constituting the airbag 1 is not limited.
15 and the seam 5 of the lower wall 1b is located inside the airbag 1 as shown in FIG. 15, as described above, the outer peripheral edges 3, When the airbag 4 is folded, the folded thickness of the airbag in the folded region including the stitched portion 5 is increased by the thickness of the stitched portion 5 compared with the other folded regions.

[0004] Specifically, the folded thickness of the folded area not including the stitched portion 5 is 2 times the sum of the thicknesses of the upper and lower walls.
In contrast to this, the folded thickness of the folded area including the stitched portion 5 is three times the sum of the thicknesses of the upper and lower walls. As a result, a drawback that the airbag device becomes difficult to be stored in the storage portion is caused.

In the case where the airbag 1 is formed in a substantially square shape, when the airbag is folded so as to overlap in the stitch direction of the stitching portion 5, the thickness of the airbag is reduced by the folding. This causes a problem that the portion 5 is increased at an overlapping portion. Therefore,
In order to cope with such a problem, the present invention is to form an airbag in which both walls are joined at their joints to form a bag and the joints are located inside as much as possible. It is an object of the present invention to provide a vehicle airbag device, an airbag, and a method of folding the airbag device, which are folded so as not to increase the airbag.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, both sides of the outer peripheral edge of the airbag which oppose each other are prevented from overlapping each other. Fold inward as both inside folds. For this reason, both opposing sides of the outer peripheral edge of the airbag are folded inside the airbag so as to further drive the joints of both walls. Therefore,
The fold thickness of the fold area including each joint of both walls of the airbag can be kept the same as the fold thickness of the other fold areas. As a result, an increase in the folded thickness of the airbag can be minimized, and the storage of the airbag is facilitated.

According to the invention described in claims 2 to 4, both outer peripheral edges located on both sides of one outer peripheral edge of the airbag are formed as both inner folded portions inside the airbag so as not to overlap each other. Will be folded. Thus, the same function and effect as the first aspect can be achieved. Here, according to the third and fourth aspects of the present invention, the outer peripheral edges of the outer peripheral edge of the airbag, on which sewing or joining processing is performed, are inclined obliquely so as not to overlap with each other in the outer peripheral edge direction. It is folded as both inside folds. as a result,
The folded thickness of the airbag does not increase due to the sewing or joining.

Here, according to the invention described in claim 4,
Opposite outer edges of the airbag, along with both inner folds,
The airbag is folded as an orthogonal folded portion from the outside toward one outer peripheral side with reference to a folding line orthogonal to the deploying direction at a middle portion in the deploying direction of the airbag. In this case, as described above, both inner folded portions are folded inside the airbag so that the outer peripheral edge of the airbag does not overlap in the direction of the outer peripheral edge. Are folded from the outside so that they do not overlap in the direction of their outer edges.

Therefore, even if the airbag is folded so as to have the orthogonally folded portion in addition to the two obliquely folded portions, the folded thickness of the airbag does not increase due to the sewing and the joining. According to the invention as set forth in claim 5, both opposing outer peripheral edges of the airbag are temporarily fastened so as not to overlap with each other before the two walls are turned over. The inside of the airbag is automatically formed when both walls are turned inside out because both sides are turned into inside folded portions inside the airbag.

Therefore, the same operation and effect as the first aspect of the present invention can be achieved while eliminating the folding work for forming the both inner folded portions. According to the invention described in claim 6, it is possible to provide an airbag that can achieve the operation and effect of the invention described in claim 1. According to the invention described in claims 7 to 10, both outer peripheral edges located on both sides of one outer peripheral edge of the airbag do not overlap with each other.
Both folds are folded inside the airbag.

Thus, it is possible to provide an airbag which can achieve the functions and effects of the invention described in claim 2. Here, according to the invention described in claims 8 and 9, the opposing outer peripheral edges of the airbag together with both inner folded portions are based on a folding line orthogonal to the deploying direction at a middle portion of the airbag in the deploying direction. It is folded as an orthogonal fold from the outside toward one outer peripheral side. This makes it possible to provide an airbag that can achieve the functions and effects of the invention described in claim 6.

According to the eleventh aspect of the present invention,
A vehicle airbag device including the airbag according to the fifth aspect of the invention and capable of achieving the same functions and effects as the invention can be provided. According to the twelfth to fifteenth aspects of the invention, there is provided a vehicle airbag apparatus including the airbag according to the seventh to tenth aspects and capable of achieving the same operation and effect as the invention. obtain.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a side collision type airbag device for a vehicle according to the present invention. The side collision type airbag device is attached to a driver's seat side wall portion of a backrest portion (not shown) of a passenger seat of the vehicle. The airbag device includes an airbag B and an inflator G. I have.

The airbag B is integrally formed of a cloth material so as to have a substantially square airbag body 10 and a tongue piece 20. The airbag body 10 includes the upper wall 1
0a and the lower wall 10b are overlapped and sewn with sewing thread so as to form a seam L (see FIG. 4) along each outer peripheral edge thereof, thereby forming a bag shape.

However, as described above, the upper wall 10a and the lower wall 10
b, the upper wall 10a and the lower wall 10b
Is turned over to form the airbag body 10.
As a result, the seam allowance including the seam L of the upper wall 10a and the lower wall 10b is located inside the airbag main body 10, thereby eliminating harm to the outside (see FIG. 6).

An opening 11 for accommodating the inflator G is formed on one outer peripheral edge P1 (see FIGS. 1 and 4) which constitutes one side of the airbag body 10. In addition, a reinforcement sewing portion 10c is formed in the upper wall 10a in the vicinity of the opening 11. This sewn portion 10c is
1, a reinforcing cloth 1 superposed on the inner surface of the upper wall 10a
In the vicinity of the reinforcing cloth 12 and the opening 11 of the upper wall 10a corresponding to the reinforcing cloth 12, a pair of mounting holes 13 and 14 are formed to penetrate as shown in FIG. .

The reinforcing cloth 12 is provided along the outer peripheral edge thereof, together with the corresponding portion of the upper wall 10a, and before the upper wall 10a and the lower wall 10b are sewn, the seam 12 shown in FIG.
As shown by a, it is sewn with sewing thread. Further, a reinforcement sewing portion 20a is formed in the overlapping portion 20b of the tongue piece 20 so as to correspond to the sewing portion 10c. The sewn portion 20a has a reinforcing cloth 21 superposed on the inner surface of the overlapping portion 20b. The reinforcing cloth 21 and a corresponding portion of the overlapping portion 20b correspond to a pair of mounting holes 22, 23. As shown in FIG. 1, through holes are formed at positions corresponding to the mounting holes 13 and 14.

The reinforcing cloth 21 is sewn with sewing threads along the outer peripheral edge thereof and the corresponding portion of the overlapping portion 20b as shown by the seam 21a in FIG. However, in the present embodiment, as the cloth material forming the airbag body 10, the tongue piece 20, and the reinforcing cloths 12, 21, synthetic fibers such as nylon and polyethylene,
Fibers such as plant fibers and animal fibers are employed.

As shown in FIGS. 2 and 3, the inflator G is housed in an opening 11 of the airbag body 10, and the axial direction of the inflator G is the width of the opening 11 of the airbag body 10. Direction (vertical direction of the backrest). The inflator G includes an inflator body 30, and the inflator body 30 includes:
It is assembled in the metal case 40.

The metal case 40 is located in the opening 11 and extends along the outer peripheral wall of the metal case 40 so that the tongue 20
Extend from the outside at the overlapping portion 20b on the side wall portion of the upper wall 10a of the opening portion 11. Tongue piece 20
The upper wall 10a of the metal case 40 and the upper frame 10a of the mounting frame 5
0, and these overlapping portions 20b
And the side wall of the upper wall 10a of the opening 11
4 are attached from the inside of the upper wall 40a of the metal case 40 to the through holes 41 and 42, and the mounting holes 1 of the sewing portions 10c and 20a.
3, 14, 22, and 23 and the mounting frame 50 are clamped by being inserted into the through holes 51 and 52 and tightening the nuts 45 and 46.

Next, a method of folding the airbag B accommodating the inflator G will be described with reference to FIGS. First, both outer peripheral edges P2, P3 located on both sides of one outer peripheral edge P1 of the outer peripheral edges of the airbag main body 10.
As shown by an arrow A in FIG. 5, together with both end portions of the outer peripheral edge portion P4 opposed to the one outer peripheral edge portion P1, diagonally inward of the airbag body 10 with respect to folding lines H1 and H2. It folds as inside folding parts D1 and D2.

Here, the airbag main body 10 is
After the a and b are sewn along the seam L to form a bag, the walls 10a and 10b are turned upside down. The seam allowance including the seam L is located inside the airbag body 10. The folding line H1 is, as shown in FIG.
This corresponds to a straight line inclined by a predetermined angle θ with respect to an intersection Q1 between the center line Q of the airbag body 10 and the opposing outer peripheral edge P4. On the other hand, the folding line H2 has two outer peripheral edges P1, P3.
4 and a peripheral portion P34 between the outer peripheral edges P3 and P4, and the folding line H2 is a center line. Slant to Q.

However, the folding line H of the airbag body 10
1 (inside fold portion D1) is folded inside the airbag body 10 based on the fold line H1, and a fold line H2 of the airbag body 10 is formed.
When the lower portion (inner folded portion D2) is folded inside the airbag body 10 based on the folding line H2, the inside folded portions D1 and D2 do not overlap each other in the airbag body 10. As described above, the respective fold widths of the inside folded portions D1 and D2 and the above-described predetermined angle θ are selected.

Therefore, as described above, when the inside folded portions D1 and D2 are folded into the airbag body 10,
The airbag body 10 is in a folded state as shown in FIGS. In this case, instead of being folded from the outside as shown in FIG. 15, both inside folded portions D1, D
6 is folded inward so as to further drive the seam allowance into the airbag body 10 as illustrated in FIG.

For this reason, the folded thickness of the folded area of the airbag body 10 including the above-mentioned seam allowance is substantially the same as the thickness of the other folded areas, and the thickness of each of the upper wall 10a and the lower wall 10b. It is only twice the sum of the sums. As a result, the initial folded thickness of the airbag body 10 can be reduced to the minimum necessary over the entire folded area.

Further, as described above, both inner folded portions D
Since the airbag body 10 does not overlap with each other in the airbag body 10, the folded thickness of the airbag body 10 is limited to the upper wall 10a, the lower wall 10b, and the inner folded portion D1 (or
It is only the sum of the thicknesses of D2). In addition, each fold width of the both inside folded portions D1 and D2 and the above-mentioned predetermined angle θ are:
Assuming that the inside folded portions D1 and D2 do not overlap each other in the airbag body 10 and that the folded portions of the outer peripheral edge of the airbag body 10 do not overlap in the seam direction of the seam L, and are appropriately changed and implemented. May be.

Next, the airbag body 10 folded as described above is orthogonally folded from the outside toward the lower wall 10b so as to be orthogonal to the center line Q with respect to the folding line R shown in FIG. Fold as. Here, the fold line R is formed between the opposing outer peripheral edge P4 of the airbag body 10 and the reinforcing cloth 1.
At a substantially central position between the second seam 12a and the right side in FIG. 5, it corresponds to a line orthogonal to the center line Q.

Therefore, when the airbag body 10 is folded on the basis of the folding line R as described above, the airbag body 10 having both inside folded portions D1 and D2 is folded as shown in FIG. In this case, as described above, the inside folded portions D1 and D2 are folded inside the airbag body 10 at an angle to the center line Q so as not to overlap with each other. For this reason, the portion included in the orthogonal fold portion D3 of the seam L only intersects with each portion included in both inner fold portions D1 and D2 of the seam L, and does not overlap in the seam direction.

Accordingly, the thickness of the airbag body 10 having both inner folds D1, D2 and the orthogonal fold D3 is thinner than when the seams in the seam L direction overlap. After such folding, the airbag body 10 is folded as an orthogonal folded portion D4 (see FIG. 8) toward the upper wall 10a with reference to the folding line R1 shown in FIG. Furthermore, the folding line R of the airbag body 10
As shown in FIG. 8, a portion closer to the distal end than 1 is folded as an orthogonal folded portion D5 on the orthogonal folded portion D4 with respect to the folding line R1.

Here, the folding line R1 is the same as the folding line R
At a substantially central position between the seam 12a of the reinforcing cloth 12 and the right side in FIG. 7, it corresponds to a line orthogonal to the center line Q. Accordingly, when the airbag body 10 is folded on the basis of the folding line R1 as described above, the airbag body 10 having the inside folding portions D1, D2 and the orthogonal folding portion D3 is in a folded state as shown in FIG.

In this case, as described above, the center line Q is set so that the inside folded portions D1 and D2 do not overlap each other.
Is folded inside the airbag body 10 at an angle. Moreover, each of the orthogonal folds D3, D4, D5 is folded on the basis of the fold lines R, R1 parallel to the center line Q and parallel to each other. Therefore, both obliquely folded portions D1, D
2. The portions of the seam L included in the two orthogonal folded portions D3, D4, D5 do not overlap each other, and as a result, the folded thickness of the airbag body 10 can be reduced without being affected by the seam L.

After such folding, the airbag body 1
0 to the lower wall 1 based on the folding line R2 shown in FIG.
It is folded from the outside to the 0b side as an orthogonal folded portion D6 (see FIG. 9). Here, the fold line R2 is the fold line R
At a substantially central position between 1 and the right side of the seam 12a of the reinforcing cloth 12 in FIG. 8, it corresponds to a line orthogonal to the center line Q. Accordingly, when the airbag body 10 is folded on the basis of the folding line R2 as described above, the airbag body 10 having both inside folded portions D1 and D2 and the orthogonal folded portions D3 to D5 is in a folded state as shown in FIG.

In this case, as described above, the center line Q is set so that the inside folded portions D1 and D2 do not overlap each other.
Are folded obliquely inward of the airbag body 10. Moreover, each of the orthogonal folds D3, D4, D5
It is folded on the basis of folding lines R and R1 parallel to each other and perpendicular to the center line Q. Therefore, both inner folds D
1, D2 and the portions of the seam L included in the two orthogonal folded portions D3, D4, D5 do not overlap each other, and as a result, the folded thickness of the airbag body 10 can be reduced without being affected by the seam.

After the folding is repeated in this manner, the airbag body 10 is folded as an obliquely folded portion D7 from the outside toward the upper wall 10a with reference to the folding line R3 shown in FIG. 9 (see FIG. 10). Here, the folding line R3
Is equivalent to a straight line connecting a point above the center line Q on the folding line R2 by a predetermined distance in FIG. 9 and a boundary P12 between the outer peripheral edges P1 and P2, and this folding line R3 Are inclined with respect to the center line Q.

In this case, as described above, both inner folded portions D1 and D2 are inclined in the direction inclined with respect to the center line Q, that is, in the direction inclined with respect to the portions along the outer peripheral edges P2 and P3 of the seam L. Is folded. In addition, the orthogonal folds D3 to D5 are also folded such that the stitches L do not overlap in the stitch direction, as described above. Therefore, as described above, even if the diagonally folded portion D7 is provided thereafter, the seam L does not overlap in the seam direction.

For this reason, the folded airbag body 10
Is approximately equal to the sum of the folded thicknesses of the seamless portions of the upper wall 10a and the lower wall 10b. As a result, the folded thickness of the airbag body 10 is suppressed to a minimum, so that the airbag B can be easily stored in the storage section. In addition, as described above, the inner folded portion D
Since the folding width of the inside fold portion D2 into the airbag body 10 is larger than the folding width of the inside fold portion D2 into the airbag body 10, both outer peripheral edges are obtained when the inside fold portion D7 is folded with respect to the fold line R3. The thickness near the boundary between P1 and P2 can be reduced.

When the ignition control device ignites the inflator G in response to the detection of the acceleration sensor for the collision of the vehicle in a state where the airbag B folded as described above is stored in the storage section, the inflator G
From the inflator body 30 to the airbag body 10
The gas is injected through the opening 11 and the airbag body 10 is deployed in the above-described deployment direction (the front direction of the backrest of the passenger seat). In this case, since the airbag body 10 is sequentially deployed in the direction opposite to the folding direction, the deployment of the airbag body 10 is performed smoothly.

Next, a modification of the above embodiment will be described with reference to FIG.
This will be described with reference to FIGS. In this modification, both the walls 10a and 10b described in the above embodiment are sewn along the seam L as shown in FIG. Thereafter, before turning over the two walls 10a and 10b, the outer peripheral edges of the two walls 10a and 10b corresponding to the both sides P2 and P3 of the airbag main body 10 are, as shown in FIG. After folding (see FIG. 11) as a reference, they are temporarily fixed to each other with sewing threads so as not to overlap each other.

After that, if both walls 10a and 10b are turned over,
With this inversion, both walls 1 corresponding to both sides P2 and P3
The outer peripheral edges 0a, 10b are folded into the inside of the airbag body 10 as described in the above embodiment.
2 are formed. Thereby, both inside folds D1 to the inside of the airbag body 10 along with the two walls being turned over,
D2 is automatically formed.

For this reason, the same operation and effect as those based on the both inside folds D1 and D2 in the above embodiment can be achieved while eliminating the fold work for forming the both inside folds D1 and D2. In the practice of the present invention, an example in which the present invention is applied to a side collision type airbag device for a passenger seat has been described. Instead, for example, the present invention is applied to an airbag device for a driver's seat. May be implemented.

In practicing the present invention, the airbag body 10 may be formed by joining means such as an adhesive or heat welding instead of sewing. In practicing the present invention, the airbag may have a substantially square shape without a tongue piece. In this case, it is desirable that an inflator opening is formed in the vicinity of one outer peripheral edge forming one side of the airbag.

In practicing the present invention, the airbag is not limited to a substantially square shape, and may be, for example, a round shape, and the position of the opening is not particularly limited. In practicing the present invention, each of the inner folds D1, D2, D7 and each of the orthogonal folds D3 to D5 are folded in the opposite direction to the fold direction described in the above embodiment. Is also good.

In practicing the present invention, instead of the inside folds D1 and D2, both inside folds parallel to the center line of the airbag may be used.
They may be the same.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view showing a state in which an inflator is stored in an opening of the airbag body of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a perspective view showing folding lines H1 and H2 of the airbag body.

FIG. 5 is a perspective view showing a state where the airbag body is folded on the basis of folding lines H1 and H2.

FIG. 6 is a partially enlarged sectional view taken along line 6-6 in FIG.

FIG. 7 is a plan view showing a state in which the airbag body is folded on the basis of a folding line R in FIG. 5;

FIG. 8 is a plan view showing a state where the airbag body is folded on the basis of a folding line R1 in FIG. 7;

FIG. 9 is a plan view showing a state where the airbag body is folded on the basis of a folding line R2 in FIG. 8;

FIG. 10 is a plan view showing a state where the airbag body is folded on the basis of a folding line R3 in FIG. 9;

FIG. 11 is a plan view of an airbag before turning over both walls, showing a modification of the embodiment.

FIG. 12 is a plan view showing a state in which the airbag of FIG. 11 is folded and temporarily fastened based on a center line Q as a reference.

FIG. 13 is a plan view showing a state where the airbag of FIG. 12 is turned upside down.

FIG. 14 is a perspective view showing a conventional airbag folding method.

15 is a partially enlarged sectional view taken along line 15-15 in FIG.

[Explanation of symbols]

B: airbag, D1, D2: inside fold, D3 to D5: orthogonal fold, G: inflator, H1, H
2, R, R1, R2: folding line, P1 to P4: outer peripheral edge, 10: airbag body, 10a: upper wall, 10b: lower wall, 11: opening.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Sugimura 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan

Claims (15)

[Claims] 1. A vehicle airbag (B) in which both walls are joined at their joints to form a bag shape and the joints are located on the inner side, is developed with reference to the opening. In the folding method, the both sides (P2, P3) of the outer peripheral edge of the airbag that oppose each other are not overlapped with each other, so that both inner folds (D1, D2) are placed inside the airbag. A method for folding an airbag for a vehicle, wherein the method comprises folding the airbag. 2. A substantially rectangular vehicle airbag (B) having both walls joined at respective joints to form a bag shape and each joint positioned inside, and one side of the airbag (B). The airbag formed with the opening (11) on the outer peripheral edge (P1) side, which constitutes the above, has a deployment direction (Q) toward the outer peripheral edge (P4) opposed to the one outer peripheral edge with reference to the opening. ), Wherein the outer peripheral edges (P2, P3) located on both sides of the one outer peripheral edge of the airbag are inwardly inwardly of the airbag so as not to overlap each other. A method for folding a vehicle airbag, wherein the folding is performed as folding portions (D1, D2). 3. The method of folding an airbag for a vehicle according to claim 2, wherein the inner folding portion is folded obliquely with different widths together with both ends of the opposed outer peripheral edge. 4. An outer peripheral edge of the opposed outer peripheral edge, together with the two inner folded portions, is directed toward the one outer peripheral edge side with respect to a folding line (R) orthogonal to the deployment direction at an intermediate portion in a deployment direction of the airbag. The method of folding an airbag for a vehicle according to claim 3, wherein the folding is performed as an orthogonal folding part (D3) from the side. 5. A vehicle airbag (B) in which both walls are joined at their joints to form a bag shape, and then the walls are turned upside down so that the joints are located inside. In a folding method in which the airbag is folded so as to be deployable with reference to an opening, both sides (P2, P3) of the outer peripheral edge of the airbag facing each other are not overlapped with each other before the two walls are turned over. A method for folding an airbag for a vehicle, comprising: temporarily fastening the inner wall of the vehicle, and then turning the two walls inside out so as to be folded into the inside of the airbag (D1, D2). 6. An airbag (B) in which both walls are joined at their respective joints to form a bag and each joint is located inside, with reference to the opening (11). In an airbag for a vehicle that is folded so as to be deployable, both sides (P2, P3) of the outer peripheral edge of the airbag that oppose each other are inwardly folded to the inside of the airbag so that the opposite sides (P2, P3) do not overlap each other. An airbag for a vehicle, wherein the airbag is folded as D2). 7. A substantially square airbag (B) in which both walls are joined at their joints to form a bag shape and the joints are located inside, and one side of the airbag (B) is formed. A vehicle airbag folded so as to be deployable in a deployment direction toward an outer peripheral edge (P4) opposed to the one outer peripheral edge with reference to the opening (11) formed on the one outer peripheral edge (P1) side; Wherein the outer peripheral edges (P2, P3) located on both sides of the one outer peripheral edge are folded as both inner folded portions (D1, D2) so as not to overlap with each other. 8. The airbag according to claim 7, wherein the both inner fold portions are folded together with both ends of the opposite outer peripheral edge in a diagonal direction to the inside of the airbag at different fold widths. Airbag for vehicles. 9. The opposed outer peripheral edge, together with the two oblique inner folding portions, is directed toward the one outer peripheral edge side with respect to a folding line (R) orthogonal to the deployment direction at an intermediate portion in the deployment direction of the airbag. From outside, orthogonally folded part (D3)
The vehicle airbag according to claim 8, wherein the airbag is folded. 10. The orthogonally folded portion, together with the corresponding portion of the airbag, is folded from the outside based on a folding line (R1) parallel to the folding line. 10. The vehicle airbag according to claim 9. 11. An airbag (B) in which both walls are joined at their joints to form a bag-like shape and each joint is located inside, based on the opening (11) of the airbag (B). An airbag device for a vehicle, comprising: an airbag folded to be deployable in a deployment direction (Q); and an inflator (G) housed in the opening, wherein two opposing outer peripheral edges of the airbag ( P2, P3) are folded inside the airbag as both inside folds (D1, D2) so that they do not overlap each other. 12. A substantially square airbag (B) in which both walls are joined at their joints to form a bag shape and each joint is located inside, and one side of which is formed. An airbag folded so as to be deployable in a deployment direction (Q) toward an outer peripheral edge (P4) opposed to the one outer peripheral edge with reference to the opening (11) formed on one outer peripheral side (P1); A vehicle airbag device provided with an inflator (G) housed in the airbag, wherein the outer peripheral edges (P2, P3) located on both sides of the one outer peripheral edge of the airbag do not overlap with each other. An airbag device for a vehicle, wherein the airbag device is folded inside both sides as folded portions (D1, D2). 13. The airbag device for a vehicle according to claim 12, wherein the inside folded portions are folded obliquely together with both ends of the opposite outer peripheral edge so as to have different folding widths. 14. The opposed outer peripheral edge, together with the inner folded portions, is directed toward the one outer peripheral side with respect to a folding line (R) orthogonal to the deployment direction at a middle portion in the deployment direction of the airbag. 14. The vehicle airbag device according to claim 13, wherein the vehicle airbag device is folded as an orthogonal folded portion (D3). 15. The orthogonal folded portion, together with a corresponding portion of the airbag, is folded from the outside based on a folding line (R1) parallel to the folding line. 15. The vehicle airbag device according to 14.