JP4096855B2 - Airbag device - Google Patents

Description

  The present invention includes a case that includes a folded airbag and an inflator that supplies inflation gas to the airbag and includes an opening through which the airbag can protrude, and covers the opening of the airbag. The present invention relates to an airbag device including an airbag cover having a door portion that can be opened when deployed and inflated.

  2. Description of the Related Art Conventionally, in an airbag device, a case is provided with a locking claw portion for assembling an airbag cover around a peripheral wall portion around an opening, and the locking claw portion is disposed on the peripheral wall portion near the outside of the peripheral wall portion. The airbag cover is assembled to the case by engaging with the peripheral edge of the engagement hole formed on the assembly piece of the airbag cover that is arranged along (see, for example, Patent Document 1).

In the conventional airbag device, the locking claw portion protrudes so as to intersect the peripheral wall portion and can be inserted into the locking hole portion, and the bottom of the case from the tip of the locking shaft portion And a locking piece that is bent toward the side and can be locked to the periphery of the locking hole.
Japanese Patent Laid-Open No. 2003-40071

  Normally, in this type of airbag device, when the airbag is deployed and inflated, the airbag inflates while inflating the gas for inflation discharged from the inflator and pushing the door portion formed in the airbag cover open. For this reason, a large stress is generated at the portion of the locking claw part in which the airbag cover is assembled to the case. However, in the conventional airbag device, there is no room for improvement in securing the assembly strength between the case and the airbag cover because no means for improving the strength is taken at the portion of the locking claw portion. It was.

  In the conventional airbag device, when the airbag cover is assembled to the case, the airbag cover is moved to the case side, the locking shaft portion is inserted into the locking hole portion, and the locking piece portion is locked to the locking hole. It was locked to the periphery of the part. However, in the conventional airbag device, since the latching claw portion protrudes from the case peripheral wall portion, when the airbag cover is assembled to the case, it is not necessary to move the airbag cover to the case side. The tip of the attachment piece comes into contact with the locking claw and cannot be moved to the bottom side of the case. Therefore, in the conventional airbag device, when the airbag cover is assembled to the case, the assembly piece is spread and spread apart from the peripheral wall so that the assembly piece does not hit the locking claw. It was necessary to maintain the state and move the airbag cover to the bottom side of the case, and the assembly work of the airbag cover to the case was not easy.

  The present invention solves the above-described problems, and provides an airbag device that can firmly assemble an airbag cover to a case and that can be easily assembled to the case of the airbag cover. The purpose is to provide.

An airbag device according to the present invention has a bottomed box shape that houses a folded airbag and an inflator that supplies inflation gas to the airbag, and includes an opening through which the airbag can protrude. And the case
An airbag cover having a door portion that covers the opening of the case and can be opened when the airbag is deployed and inflated;
With
The case is configured to include a locking claw portion that is disposed on the peripheral wall portion around the opening and is used to assemble the airbag cover,
The air bag cover is disposed along the peripheral wall portion in the vicinity of the outer side of the peripheral wall portion so that the air bag cover can be assembled to the case using the locking claw portion, and the locking claw portion can be inserted. An assembly piece having a hole portion is provided and configured.
The locking claw is
A locking shaft portion that protrudes so as to intersect with the peripheral wall portion, and can be inserted into the locking hole portion;
A locking piece that is bent from the front end of the locking shaft toward the bottom of the case and can be locked to the periphery of the locking hole;
In an airbag device configured to include:
The locking claw part includes a reinforcing bead that protrudes from the peripheral wall part side to the distal end side of the locking shaft part to the outside of the peripheral wall part,
Beads, to the tip end of the or the peripheral wall portion side et locking shaft portion, the projecting end, is inclined to a triangular shape when viewed from the side, is formed,
The inclined surface on the protruding end side of the bead guides the front end of the assembly piece in the airbag cover moving to the case side to be separated from the peripheral wall when the airbag cover is assembled to the case. It is configured to be possible .

  In the airbag device of the present invention, since the locking claw portion is provided with a reinforcing bead protruding from the peripheral wall portion side to the distal end side of the locking shaft portion, the locking shaft The bending rigidity with respect to the peripheral wall part of a part can be improved. Therefore, in the airbag device of the present invention, the airbag cover can be firmly assembled to the case.

  Further, in the airbag device of the present invention, the bead is configured so as to be inclined from the peripheral wall portion side to the distal end side of the locking shaft portion so that the protruding end side is triangular when viewed from the side. Therefore, when the airbag cover is assembled to the case, even if the front end of the assembly piece comes into contact with the locking claw, the front end of the assembly piece is guided by the inclined surface on the protruding end side of the bead. It can be easily expanded so as to be spaced apart from each other. That is, in the airbag device of the present invention, when the assembly piece of the airbag cover is slid to the bottom side of the case, the assembly piece is automatically formed along the inclined surface on the protruding end side of the bead. When the locking claw part reaches the position of the locking hole, the assembly piece is automatically restored and the locking claw is simply locked to the periphery of the locking hole. Will be. Therefore, the locking claw can be easily locked to the periphery of the locking hole of the assembly piece, and the airbag cover can be easily assembled to the case.

  Therefore, in the airbag device of the present invention, the airbag cover can be firmly assembled to the case, and the assembly operation of the airbag cover to the case is easy.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, a knee protection airbag device S will be described as an example of an airbag device to which the present invention is applicable. As shown in FIGS. 1 and 4, the knee protection airbag device S protects the knee K (KL / KR) of the driver MD as an occupant. It is arranged below.

  In addition, the upper and lower sides, the left and right, and the front and rear in this specification correspond to the upper and lower, left and right, and front and rear of the vehicle when the knee protection airbag device S is mounted on the vehicle.

  As shown in FIG. 1, the steering column 9 includes a column main body 10 connected to the steering wheel 8 and a column cover 13 disposed so as to cover the column main body 10 below the steering wheel 8. Has been. The column body 10 includes a main shaft 11 and a column tube 12 that covers the periphery of the main shaft 11.

  The column cover 13 is made of a synthetic resin having a substantially rectangular tube shape, and is disposed along the axial direction of the column main body 10 so as to cover the column main body 10. A rear surface 13a of a portion of the column cover 13 that protrudes from an instrument panel (hereinafter abbreviated as “instrument panel”) 14 has a substantially rectangular plate shape, and is formed in a curved shape that rises rearward in the vehicle front-rear direction.

  The knee protection airbag device S houses a folded airbag 51, an inflator 44 that supplies inflation gas to the airbag 51, the folded airbag 51 and the inflator 44, and opens the vehicle rear side. The case 17 and an airbag cover 33 that covers the vehicle rear side of the opening 18a in the case 17 are provided.

  As shown in FIGS. 1 to 5, the case 17 is made of sheet metal and is disposed on the lower side of the steering column 9. The case 17 includes a case body 18 and a panel member 22 that are formed separately. The case main body 18 and the panel member 22 are integrated by fixing a fixing portion 25 (described later) of the panel member 22 to a peripheral wall portion 19 (described later) of the case main body 18 by welding.

  The case body 18 has a box shape with a bottom, and includes a substantially rectangular tube-shaped peripheral wall portion 19 and a bottom wall portion 20 that closes the vehicle front side of the peripheral wall portion 19, and has a substantially rectangular shape on the vehicle rear side. An opening 18a is provided. A plurality of locking claws 26 (to be described later) formed on the panel member 22 are disposed on the outer surface side of the wall portions 19 a and 19 b that are vertically opposed to each other in the peripheral wall portion 19. Further, the side wall 19c of the peripheral wall 19 is formed with an insertion hole 19d through which a main body 45 described later of the inflator 44 can be inserted (see FIG. 3). Further, two insertion holes 20 a are formed in the bottom wall portion 20 for inserting a later-described bolt 46 c of the inflator 44.

  The panel member 22 can support the vehicle front side of the airbag 51 that has been deployed and inflated when the airbag 51 is deployed and inflated, and a body portion that is disposed so as to surround the opening 18 a of the case body 18. 23, a connecting portion 31 that connects the case 17 to the body 1 side of the vehicle, and a locking claw portion 26 for assembling the airbag cover 33 to the case 17.

  The main body 23 includes an insertion hole 24 into which the peripheral portion of the opening 18 a in the peripheral wall 19 of the case main body 18 can be inserted. A fixing portion 25 for fixing the panel member 22 to the case main body 18 is disposed at a portion that becomes the periphery of the fitting insertion hole 24. The fixing portion 25 is disposed so as to protrude from the main body portion 23 toward the vehicle front side, and is fixed to the outer peripheral surface of the peripheral wall portion 19 of the case main body 18. The fixing portion 25 is disposed on the periphery of the fitting insertion hole 24 over substantially the entire circumference. In the case of the embodiment, the portions 25 c and 25 d disposed on the left and right sides of the fixing portion 25 are fixed to the peripheral wall portion 19 near the tip, and a gap is provided between the base portion portion 25 e and the peripheral wall portion 19. Is formed. The left and right side walls 38 and 39 (to be described later) of the airbag cover 33 are disposed between the base portion 25e and the peripheral wall 19 (see FIG. 3). Further, as shown in FIGS. 2 and 5, a plurality of (four in the embodiment) insertion holes 23 a through which the later-described upper side wall portion 36 of the airbag cover 33 is inserted are formed in the main body portion 23.

  The locking claw portions 26 are provided in the fixing portion 25 so as to extend from the portions 25a and 25b on the upper wall portion 19a side and the lower wall portion side 19b side of the peripheral wall portion 19, respectively. A plurality of the locking claw portions 26 are disposed on the upper wall portion 19a side and the lower wall portion 19b side, respectively (four in the case of the embodiment). And a unit 28. The locking shaft portion 27 protrudes so as to intersect with the portions 25 a and 25 b on the peripheral wall portion 19 side in the fixing portion 25, and upper and lower side wall portions 36 and 37 to be described later as assembling pieces in the airbag cover 33. It is possible to be inserted into the locking holes 36a and 37a formed in. The locking piece portion 28 is bent from the distal end 27a of the locking shaft portion 27 toward the bottom wall portion 20 side of the case 17, and can be locked to the periphery of the locking hole portions 36a and 37a. It is said that.

  In addition, the locking claw portion 26 includes a reinforcing bead 29 that protrudes from the peripheral wall portion 19 side to the distal end 27a side of the locking shaft portion 27 toward the outer side (vehicle rear side) of the peripheral wall portion 19. (See FIG. 6). In the case of the embodiment, the bead 29 is disposed in the vicinity of the center in the left-right direction from the fixing portions 25a and 25b through the locking shaft portion 27 to the tip of the locking piece portion 28. As shown in FIG. 2, the bead 29 is formed by inclining the protruding end 29 a side so as to have a triangular shape when viewed from the side. In other words, the bead 29 has a protruding height toward the vehicle rear side at the portion of the locking shaft portion 27 that increases toward the fixing portions 25a and 25b, inclines the protruding end 29a side, and the vehicle rear side at the protruding end 29a. The side surface is configured as an inclined surface 29b.

  The connecting portion 31 is disposed at the edge of the main body portion 23, and in the case of the embodiment, the upper portion of the case main body 18, the lower left corner, and the right upper and lower ends near the five locations, Is formed. As shown in FIG. 4, brackets 4, 5, 6, and 7 are disposed on the body 1 side to which the respective connecting portions 31 are connected. The brackets 4 and 5 for connecting the connecting portions 31A and 31B disposed on the upper side are connected to the instrument panel reinforcement 2 on the body 1 side. The brackets 6 and 7 that connect the connecting portions 31C and 31D disposed on the lower side are connected to a center brace, a front body pillar, and the like (not shown) on the body 1 side.

  The panel member 22 is made of sheet metal and is formed by pressing. And in the case of embodiment, the bead 29 will be integrally formed with the latching claw part 26 by press work.

  The airbag cover 33 is made of an olefin-based thermoplastic elastomer, is configured to cover the vehicle rear side of the case 17, and is assembled to the case 17. The airbag cover 33 is disposed on the lower panel 14b side of the instrument panel 14 including the upper panel 14a and the lower panel 14b, and includes a door disposition portion 35 disposed near the opening 18a of the case body 18, and a door. A covering portion 34 is provided around the placement portion 35 so as to be able to cover the vehicle rear side of the panel member 22. The door arrangement portion 35 includes a door portion 42 and upper, lower, left, and right side wall portions 36, 37, 38, and 39 disposed in the vicinity of the periphery of the door portion 42. Yes.

  The door part 42 is formed to be slightly larger than the opening 18a of the case body 18 and has a substantially rectangular plate shape covering the opening 18a. In the embodiment, the door portion 42 includes two door portions that open in the vertical direction. The door portion 42 is provided with a hinge portion 41 serving as a rotation center at the time of opening at the upper end and the lower end, and a thin wall at a portion that is substantially H-shaped when viewed from the vehicle rear side around the door portion 42. The planned fracture portion 40 is arranged.

  The upper side wall part 36, the lower side wall part 37, the left side wall part 38, and the right side wall part 39 are adjacent to the outer peripheral side of the peripheral wall part 19 in the case main body 18, respectively, along the peripheral wall part 19 and on the vehicle front side. It arrange | positions so that it may protrude. In the embodiment, four upper side wall portions 36 are arranged corresponding to the locking claw portions 26. In the case of the embodiment, the upper side wall portion 36 disposed in the vicinity of the upper wall portion 19a of the peripheral wall portion 19 and the lower side wall portion 37 disposed in the vicinity of the lower wall portion 19b serve as the airbag cover 33. The assembly piece is assembled to the case 17. The upper and lower side wall portions 36 and 37 are formed with a plurality of rectangular opening holes 36a and 37a for locking the locking claws 26, respectively. In addition, the disengagement prevention piece which prevents the disengagement from the engagement piece part 28 of each latching claw part after latching to each latching claw part 26 in the inner peripheral surface of each locking hole part 36a * 37a. 36b and 37b are projected from the vehicle front side to the rear side.

  As shown in FIGS. 2 and 3, the inflator 44 is configured as a cylinder type whose axial direction is disposed along the left-right direction of the vehicle, and includes a substantially columnar main body 45 and a diffuser 46. . A plurality of gas discharge ports 45 a are arranged on one end side of the main body 45. A connector 48 to which an operation signal input lead wire 49 is connected is connected to the other end side of the main body 45. The diffuser 46 includes a substantially cylindrical sheet metal holding cylinder 46a that can cover the main body 45, and a plurality (two in the embodiment) of bolts 46c protruding from the holding cylinder 46a. . The holding cylinder part 46a opens a plurality of gas outlets 46b through which the expansion gas discharged from the gas discharge port 45a of the main body 45 can flow out on the rear surface of the holding cylinder part 46a mounted in the vehicle. Configured.

  The inflator 44 has an airbag operating circuit mounted on the vehicle via a lead wire 49 together with an airbag device (not shown) mounted on the steering wheel 8 when a frontal collision of the vehicle is observed. An operation signal is input.

  The airbag 51 is formed of a woven fabric made of flexible polyester, polyamide yarn, or the like, and has a substantially rectangular plate shape as shown by the two-dot chain line in FIGS. At the same time, the shape is provided with a lateral width dimension capable of protecting the knees KL and KR of the driver MD as the occupant. Further, as shown in FIG. 3, two insertion holes 51a and 51a and one insertion hole 51b are formed in the lower end portion of the airbag 51 when the inflation is completed. The insertion holes 51 a and 51 a are for inserting the bolts 46 c of the inflator 44, and the insertion hole 51 b is for inserting the main body 45 of the inflator 44. And the airbag 51 makes the main body 45 of the inflator 44 protrude from the insertion hole 51b, and the periphery of each insertion hole 51a is clamped by the holding | maintenance cylinder part 46a and the bottom wall part 20 of the case main body 18, and case body 18 is attached.

  Next, the mounting of the knee protection airbag device S of the embodiment on a vehicle will be described. First, the inflator 44 is accommodated in the airbag 51 so that the bolt 46c protrudes from the insertion hole 51a and the end of the main body 45 protrudes from the insertion hole 51b, and the airbag 51 is folded. Next, the airbag 51 is wrapped with a wrapping film (not shown) that can be broken to prevent it from collapsing. At this time, the bolt 46c of the inflator 44 projecting from the insertion holes 51a and 51b and the end of the main body 45 are projected from the wrapping film.

  Next, the bolts 46c of the inflator 44 are protruded from the insertion hole 20a and fixed to the nut 47, and the end of the inflator main body 45 is protruded from the insertion hole 19d, so that the inflator 44 is folded together with the folded airbag 51. Then, it is housed in the case body 18.

  Thereafter, the airbag cover 33 is assembled to the case 17. Specifically, as shown in FIG. 7A, the airbag cover 33 is moved to the case 17 side so that each upper side wall portion 36 is inserted into the insertion hole 23a formed in the main body portion 23 of the panel member 22. By doing so, the upper side wall portion 36 (lower side wall portion 37) extends along the inclined surface 29b on the protruding end 29a side of the bead 29 in each locking claw portion 26 so that the tip 36c side expands with respect to the upper wall portion 19a. It will move so that it may slide with respect to the latching nail | claw part 26, being opened (refer B of FIG. 7). When each locking hole 36a (37a) reaches the position of the locking shaft 27, as shown in FIG. 7C, the upper side wall 36 (lower side wall 37) is automatically restored, The locking piece portion 28 is locked to the periphery of each locking hole portion 36a (37a), and the airbag cover 33 can be assembled to the case 17. In the embodiment, the disengagement prevention piece 36b (37b) is disposed in the locking hole 36a (37a), and the disengagement prevention piece 36b (37b) is formed by the upper wall portion 36 (lower wall portion 37). ) Can be bent outwardly of the case 17 in the direction opposite to the moving direction of the upper side wall portion 36 (lower side wall portion 37), and the locking piece portion 28 can be inserted. The locking piece 28 can be locked to the peripheral edge of the locking hole 36a (37a) without hindrance. Even if the disengagement prevention pieces 36b and 37b interfere with the locking piece portion 28 and the upper and lower side wall portions 36 and 37 are difficult to be restored, the upper and lower side wall portions 36 and 37 are connected to the peripheral wall portion 19 by a finger or the like. If pushed to the side, the upper and lower side wall portions 36 and 37 can be easily restored.

  Then, each connecting portion 31 of the case 17 is attached and fixed to the body 1 side using the brackets 4, 5, 6, and 7, and at the same time, the connector 48 to which the lead wire 49 is connected is connected to the inflator body 45. . After that, if the instrument panel 14 and the under cover 15 (see FIGS. 1 and 2) are attached, the airbag device S can be mounted on the vehicle.

  If the operation signal is input to the inflator body 45 through the lead wire 49 after the airbag device S is mounted on the vehicle, the inflation gas is discharged from the gas discharge port 45a of the inflator 44, and the inflation gas is changed to the diffuser 46. Then, the gas flows into the airbag 51 through the gas outlet 46b. The airbag 51 is inflated to break a wrapping material (not shown), press the door portion 42 of the airbag cover 33, and break the planned break portion 40. And the door part 42 will open up and down centering on the hinge part 41, and the airbag 51 will expand | deploy and inflate as shown with the dashed-two dotted line of FIG.

  And in the airbag apparatus S of embodiment, the latching claw part 26 arrange | positioned at the case 17 is a peripheral wall part from the peripheral wall part 19 (adhering part 25a * 25b) side to the front-end | tip 27a side of the latching shaft part 27. 19 is provided with a reinforcing bead 29 that protrudes to the outside of 19. Therefore, the bending rigidity with respect to the peripheral wall 19 side (fixed portions 25a and 25b) of the locking shaft portion 27 can be increased, and the airbag cover 33 can be firmly assembled to the case 17.

  Further, in the airbag device S of the embodiment, the bead 29 is inclined from the peripheral wall portion 19 side to the distal end 27a side of the locking shaft portion 27 so that the protruding end 29a side has a triangular shape when viewed from the side. Therefore, when the airbag cover 33 is assembled to the case 17, the bead 29 is not affected even if the tips of the upper and lower side wall portions 36 and 37 as the assembling pieces come into contact with the locking claws 26. The leading end of the upper and lower side wall portions 36 and 37 is guided by the inclined surface 29b on the protruding end 29a side, and can be easily expanded so as to be separated from the peripheral wall portion 19 side. That is, in the airbag apparatus S of the embodiment, if the upper and lower side wall portions 36 and 37 of the airbag cover 33 are slid to the bottom wall portion 20 side of the case 17, the upper and lower side wall portions 36 and 37 are When the bead 29 is automatically pushed away from the peripheral wall 19 side along the inclined surface 29b on the protruding end 29a side and the locking claw 26 reaches the position of the locking holes 36a and 37a, the upper side The lower side wall portions 36 and 37 are automatically restored and the locking claw portions 26 are simply locked to the peripheral edges of the locking hole portions 36a and 37a. Therefore, the locking claw portion 26 can be easily locked to the peripheral edge of the locking holes 36 a and 37 a of the upper and lower side wall portions 36 and 37, and the airbag cover 33 can be easily assembled to the case 17. it can.

  Therefore, in the airbag apparatus S of the embodiment, the airbag cover 33 can be firmly assembled to the case 17, and the assembly work of the airbag cover 33 to the case 17 is easy.

  In the airbag apparatus S of the embodiment, the bead 29 is formed so that the protruding height toward the vehicle rear side is increased toward the fixing portions 25a and 25b at the portion of the locking shaft portion 27. . That is, the bead 29 is formed such that the portion that becomes the joint portion between each locking shaft portion 27 and the fixing portions 25a and 25b has the largest protruding height. Therefore, it is possible to further increase the bending rigidity of the locking shaft portion 27 with respect to the peripheral wall portion 19 side (fixed portions 25a and 25b).

  In the embodiment, the knee protection airbag device S disposed in front of the knee K of the seated occupant MD is taken as an example, but the airbag device to which the present invention is applicable is limited to this. Instead, the present invention can also be applied to an airbag device for a passenger seat disposed in front of the passenger seat.

It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the use condition of the airbag apparatus for knee protection which is one Embodiment of this invention. It is a general | schematic expanded longitudinal cross-sectional view of the vehicle front-back direction of the airbag apparatus for knee protection. It is a schematic sectional drawing of the III-III site | part of FIG. It is the schematic front view seen from the vehicle rear side which shows the use condition of the airbag apparatus for knee protection. It is the disassembled perspective view which looked at the airbag cover and case which are used for the airbag apparatus for knee protection of embodiment from the vehicles front side. It is a partial expansion perspective view which shows the site | part of the latching claw part of the case used for the airbag apparatus for knee protection of embodiment. It is explanatory drawing explaining the assembly | attachment process of the latching claw part and assembly | attachment piece in the airbag apparatus for knee protection of embodiment.

Explanation of symbols

17 ... Case,
18 ... the case body,
18a ... opening,
19 ... the peripheral wall,
20 ... bottom wall,
26: locking claw,
27 ... locking shaft part,
28 ... locking piece,
29 ... Bead,
29a ... protruding end,
29b ... inclined surface,
33 ... Airbag cover,
36 ... upper side wall (assembly piece),
36a ... Locking hole,
37 ... Lower side wall (attachment piece),
37a ... Locking hole,
42 ... the door,
44 ... Inflator,
51 ... Airbag,
K (KL / KR) ... knees,
MD ... Crew,
S: Air bag device for knee protection.

Claims (3)

A case having a bottomed box shape that houses a folded airbag and an inflator that supplies inflation gas to the airbag, and includes an opening that can project the airbag; and
An airbag cover configured to cover the opening of the case and have a door portion that can be opened when the airbag is deployed and inflated;
With
The case is configured to include a locking claw portion that is disposed on a peripheral wall portion around the opening and to assemble the airbag cover,
The airbag cover is disposed along the peripheral wall portion in the vicinity of the outside of the peripheral wall portion so that the airbag cover can be assembled to the case using the locking claw portion. Is provided with an assembly piece having a locking hole that can be inserted therethrough,
The locking claw portion is
A locking shaft portion that is projected so as to intersect with the peripheral wall portion, and can be inserted into the locking hole portion,
A locking piece portion that is bent from the front end of the locking shaft portion toward the bottom side of the case and can be locked to the periphery of the locking hole portion;
In an airbag device configured to include:
The locking claw part includes a reinforcing bead that protrudes from the peripheral wall part side to the distal end side of the locking shaft part to the outside of the peripheral wall part,
The bead is formed so as to be inclined from the peripheral wall portion side to the distal end side of the locking shaft portion so that the protruding end side has a triangular shape when viewed from the side ,
The inclined surface on the protruding end side of the bead separates the tip of the assembly piece in the airbag cover that moves to the case side from the peripheral wall portion when the airbag cover is assembled to the case. The airbag device is configured to be able to be guided so as to be expanded . 2. The airbag device according to claim 1, wherein the bead is formed from the peripheral wall portion side to the distal end side of the locking piece portion through the locking shaft portion. The case is configured to include a panel member disposed so as to surround the opening,
The airbag device according to claim 1, wherein an insertion hole through which the assembly piece is inserted is formed in the panel member.

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