Occupant protection devices

Abstract

To provide an occupant protection device which can accurately protect even a small-sized seated occupant.SOLUTION: An occupant protection device includes a seat belt 7, an air bag 25 which is mounted on a wrap belt 10 of the seat belt and is expanded so as to cover the front of an occupant MP when it is actuated, and an inflator 17. The air bag includes a bag body 26, and a conduit pipe part 40 which is arranged substantially along the wrap belt and is configured so that its root part side is connected to the inflator and its tip side is communicated with the bag body on the lower surface side of the bag body. The air bag includes a sub-expansion part 50 which is configured to be branched from the conduit pipe part and is expansible so as to fill a region between the vicinity of a waist part MW of an occupant and a vehicle side member DT of a vehicle arranged outside in a vehicle width direction in a sheet 1. The sub-expansion part can be brought into contact with the vehicle body side member and the vicinity of the waist part without interference with the conduit pipe part when the expansion is completed.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to an occupant protection device for protecting an occupant seated in a seat. [Background technology]

[0002] Conventional passenger protection devices include an airbag attached to a lap belt of a seat belt and an inflator that supplies inflation gas to the airbag. In this conventional passenger protection device, the airbag has a bag body that covers the front of the passenger and a conduit that allows inflation gas discharged from the inflator to flow into the bag body. The conduit extends from one outer side of the seat in the vehicle width direction and is positioned approximately along the lap belt, with its tip communicating with the bag body on the underside of the bag body. The airbag is attached to the lap belt by attaching a portion of the conduit near the tip to the lap belt (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2020-66425 Summary of the Invention [Problem to be solved by the invention]

[0004] In this conventional passenger protection device, the airbag is attached to the lap belt by attaching the distal end of the conduit, which is disposed approximately along the lap belt. Since the lap belt is worn by wrapping it around the waist of the occupant seated in the seat, the position of the distal end of the conduit will vary depending on the occupant's physique (waist measurements). In conventional passenger protection devices, the length of the conduit is typically set so that when worn by an occupant of average physique (an adult male), the bag body is inflated with its lateral center approximately aligned with the lateral center of the seat (approximately the lateral center of the occupant seated in the seat). Therefore, when an occupant protection device of this configuration is fitted to a petite occupant (an adult female), the tip of the conduit portion will be positioned more inward in the vehicle width direction than the center of the left and right sides of the seat, as the waist dimensions of a petite occupant are smaller than those of an occupant of standard build, and the bag body may inflate with its center shifted more inward in the vehicle width direction than the center of the left and right sides of the petite occupant.Therefore, there was room for improvement in terms of adequately protecting petite occupants with the bag body once it has fully inflated.

[0005] SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide an occupant protection device that can adequately protect even small occupants seated in the vehicle. [Means for solving the problem]

[0006] The occupant protection device according to the present invention is configured to protect an occupant seated in a seat, Seat belts and an airbag attached to a lap belt in a seat belt that restrains the waist of an occupant when fastened, and that inflates to cover the front of the occupant when activated; an inflator that supplies inflation gas to the airbag; The configuration is such that The airbag, a bag body that is disposed so as to cover the front of the occupant when inflation is complete; a conduit portion extending from an outer side of the seat in the vehicle width direction and arranged to be substantially aligned with the lap belt, the conduit portion having a base side connected to the inflator and a tip side connected to the bag body at the underside of the bag body, for allowing inflation gas discharged from the inflator to flow into the bag body; An occupant protection device having a configuration comprising: the airbag is configured to branch off from the conduit portion and to include a sub-inflatable portion that is inflatable to fill an area between the vicinity of the occupant's waist and a vehicle body side member that is disposed on the outer side of the seat in the vehicle width direction, The sub-inflating portion is characterized in that, when fully inflated, it is capable of coming into contact with the vehicle body member and the vicinity of the waist region without interfering with the conduit portion.

[0007] In the occupant protection device of the present invention, the airbag has a sub-inflating portion that branches off from the conduit portion and inflates to fill the space between the occupant's waist and a vehicle body member disposed outside the seat. Upon full inflation, the sub-inflating portion contacts the vehicle body member and the area around the occupant's waist without interfering with the conduit. That is, in the occupant protection device of the present invention, the sub-inflating portion is interposed between the area around the occupant's waist and the vehicle body member so as to contact both of them upon full inflation of the airbag. Therefore, even if a small occupant is seated in the airbag, and the bag body inflates at a position offset inward in the vehicle width direction relative to the center of the occupant, the occupant is pressed inward in the vehicle width direction by the sub-inflating portion supported by the vehicle body member. Furthermore, because the sub-inflating portion is positioned so as not to interfere with the conduit, it can accurately press the occupant upon full inflation. Therefore, the sub-inflating portion can move the occupant inward in the vehicle width direction so as to bring him closer to the inflated bag body, and the bag body can provide adequate protection for the occupant.

[0008] Therefore, the passenger protection device of the present invention can adequately protect even a small passenger seated in the vehicle. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a seat equipped with an occupant protection device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a side view of the seat of FIG. 1. [Figure 3] FIG. 2 is a front view of the seat of FIG. 1, showing the state in which the seat belt is fastened. [Figure 4] 1 is a schematic perspective view showing an airbag used in an occupant protection device according to an embodiment in a state where the airbag is inflated by itself; [Figure 5] FIG. 5 is a schematic vertical cross-sectional view of the airbag of FIG. 4. [Figure 6] 5 is a plan view showing the arrangement of base materials that constitute the bag body of the airbag of FIG. 4. FIG. [Figure 7] 5A and 5B are plan views of the base materials constituting the conduit portion and the sub-inflating portion of the airbag of FIG. 4, in which (A) is a plan view of the conduit portion panel constituting the upper wall portion and the sub-inflating portion of the conduit portion, and (B) is a view of the conduit portion panel with the sub-inflating portion formed therein and the conduit portion panel constituting the lower wall portion. [Figure 8] 1 is a front view of a seat in a state where an airbag has completed inflation in an occupant protection device according to an embodiment; [Figure 9] 1 is a side view of a seat in a state where an airbag has completed inflation in an occupant protection device according to an embodiment; [Figure 10] 1 is a schematic front view illustrating a state in which a small occupant is protected by an airbag when inflation is complete in the occupant protection device according to the embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below with reference to the drawings. In the embodiment, the front-rear, up-down, and left-right directions correspond to the front-rear, up-down, and left-right directions of the seat 1 unless otherwise specified. As shown in FIGS. 1 to 3, the occupant protection device S of the embodiment is mounted on a vehicle seat 1 and includes a seat belt 7, an airbag 25, and an inflator 17 that supplies inflation gas to the airbag 25. The airbag 25 is attached to a lap belt 10 (described later) of the seat belt 7. The seat 1 includes a backrest 2 and a seat cushion 3. The seat 1 equipped with the occupant protection device S of the embodiment is mounted on the vehicle with the left side facing outward in the vehicle width direction (outside the vehicle) and the right side facing inward in the vehicle width direction (center of the vehicle). In the embodiment, a door trim DT as a vehicle body member is disposed on the left side (outside the vehicle) of the seat 1 (see the two-dot chain line in FIG. 3).

[0011] In this embodiment, the seat belt 7 is mounted on the seat 1 and includes a belt body 8 for protecting an occupant MP seated in the seat 1, a tongue plate 12 attached to the belt body 8, and a buckle 13 for connecting the tongue plate 12. One end of the belt body 8 is fastened to a winding shaft of a retractor (not shown) disposed in the backrest 2, and the other end is fastened to an anchor member 14 (see FIGS. 1 and 2) disposed near the rear end of the left end 3b of the seat portion 3 of the seat 1. More specifically, the belt body 8 is disposed so as to be exposed to the outside from the upper left edge side of the backrest 2, and in this embodiment, when the occupant MP is not seated, the lap belt 10 attaching the airbag 25 is exposed to the front of the backrest 2 as shown in FIGS. 1, when the occupant MP is not seated, the lap belt 10 is exposed at the front of the backrest 2 on the left edge 2a side of the backrest 2 so as to extend substantially along the vertical direction. The belt main body 8 has the lap belt 10 and a shoulder belt 9 stored in the backrest 2. When the occupant MP is seated, with the tongue plate 12 connected to the buckle 13, the lap belt 10, which is disposed substantially along the horizontal direction between the anchor member 14 and the buckle 13, restrains the lower body MD (lumbar region MW) of the occupant MP, and the shoulder belt 9, which extends from the upper left edge of the backrest 2 and is disposed diagonally to the buckle 13, restrains the upper body MU (from the shoulders to the chest) of the occupant MP (see FIG. 3). In the seatbelt 7, a retractor (not shown) disposed in the backrest 2 has a pretensioner mechanism.

[0012] The inflator 17 is mounted on the seat 1, and in this embodiment, more specifically, is disposed at a position below the seat surface 3a of the seat 1. In this embodiment, as shown in FIGS. 1 and 2, the inflator 17 includes an inflator body 18 (detailed illustration omitted) having a generally cylindrical outer shape, and a pipe 19 extending from the inflator body 18 to supply inflation gas to the airbag 25. The pipe 19 extends from the inflator body 18, and is disposed so that its tip is positioned near the boundary between the seat bottom 3 and the backrest 2 on the left side (outside in the vehicle width direction) of the seat 1, and this tip is configured to be connected to a conduit 40 (described later) of the airbag 25 using a clamp 20 (see FIG. 9). In this embodiment, the inflator 17 is configured to start operating later than the pretensioner mechanism of the seatbelt 7 in order to restrict the belt body 8 of the seatbelt 7 from being pulled out due to the inflation of the airbag 25. Specifically, the inflator 17 is set to operate 5 ms after the pretensioner mechanism of the seat belt 7 is activated.

[0013] The airbag 25 is attached to the lap belt 10, folded into a long shape, and disposed within the area of ​​the lap belt 10 with its periphery covered by the cover 22. Specifically, the folded airbag 25 is placed on top of the lap belt 10 and its periphery covered by the cover 22 (see FIG. 3). In addition, in the unwrapped state as shown in FIG. 1, the airbag 25 is disposed on the back side (backrest 2 side) of the lap belt 10 exposed on the front surface of the backrest 2. The cover 22 is made of a flexible sheet member and is configured to be broken at a predetermined location when the airbag 25 is deployed and inflated, allowing the airbag 25 to protrude.

[0014] The airbag 25 is a bag-shaped member formed from a flexible sheet, and as shown in Figures 4 and 5, it includes a bag body 26, a conduit section 40 connected to the inflator 17, and a sub-inflator section 50 arranged to branch off from the conduit section 40.

[0015] 4 and 5, the bag body 26 has an outer shape when fully inflated that is a generally triangular prism with its axis generally aligned left-right and its width increasing from front to back toward its lower end, and includes a front wall 28 that is positioned in front and away from the occupant MP when fully inflated, a rear wall 29 and a lower wall 30 that are positioned toward the occupant MP when fully inflated, and a left wall 31 and a right wall 32 that are positioned opposite each other left-right when fully inflated. Vent holes 34 are formed in the left wall 31 and the right wall 32 to allow excess inflation gas that has flowed inside to be exhausted.

[0016] In bag body 26 of the embodiment, lower wall 30 forms thigh contact surface 37 that can come into contact with thighs MT of occupant MP when fully inflated, and rear wall 29 forms upper body restraint surface 36 that can restrain upper body MU of occupant MP when fully inflated (see FIG. 9). Bag body 26 is configured to communicate with conduit 40 via a communication hole (reference numeral omitted) at a rear lower end portion (rear end portion of lower wall 30) when fully inflated, and thigh contact surface 37 is configured from a region of lower wall 30 forward of conduit 40. In addition, in bag body 26 of the embodiment, as shown in FIG. 5, when inflated alone, the intersection angle α between lower wall 30 and rear wall 29 (more specifically, the intersection angle α between tangents to lower wall 30 and rear wall 29) is set to approximately 120°. The lower wall portion 30 (thigh contact surface 37) is disposed at a slight downward tilt toward the front when the bag body 26 is fully inflated and before the occupant is received therein (see FIG. 9).

[0017] The conduit 40 allows the inflation gas discharged from the inflator 17 to flow into the bag body 26, and is configured to extend from the outer side (left side) of the seat 1 in the vehicle width direction and be disposed substantially along the lap belt 10. The airbag 25 is configured to pass over the upper surface of the lap belt 10 when the airbag 25 is fully inflated.Conduit 40 is generally cylindrical with an open base side (left end 40a) and a closed tip side (right end 40b), and is connected at its base side (left end 40a) to pipe 19 of inflator 17 using clamp 20, while its tip side (right end 40b) is connected to bag body 26 at the bottom side of bag body 26. Conduit 40 also includes a tip section 45 located at the bottom side of bag body 26 and a base section 44 extending leftward from bag body 26, with tip section 45 being slightly wider than base section 44. As described above, conduit 40 is connected to the lower rear end of bag body 26 in the area of ​​tip section 45 located at the tip side (right end 40b). In this embodiment, the airbag 25 is attached to the lap belt 10 by directly sewing a distal end portion 45 of the conduit 40 to the lap belt 10. The conduit 40 includes an upper wall portion 41 and a lower wall portion 42 that are disposed opposite each other in the vertical direction. Specifically, the distal end region of the lower wall portion 42 (the region that forms the distal end portion 45) is sewn to the lap belt 10 with a sewing thread. In this embodiment, a stitching portion 47 that sews the lap belt 10 to the conduit 40 is formed as a double line that extends substantially along the length of the lap belt 10 (see the two-dot chain line in FIG. 7). The length of the conduit 40 is set to a dimension that allows the lateral center of the inflated bag body 26 to be positioned substantially coincident with the lateral center of the upper body of the occupant MP1, who is a male of average build, when seated, as shown in FIGS. 7 and 8.

[0018] The sub-inflating section 50, which is branched off from the conduit section 40, is configured to be inflatable so as to fill the area between the vicinity of the lumbar region MW of the occupant MP and a vehicle body member (the door trim DT in this embodiment) of the vehicle that is located on the outer side (left side) of the seat 1 in the vehicle width direction. In this embodiment, the sub-inflating section 50 is configured to have a left wall section 50a and a right wall section 50b that are located opposite each other in the left-right direction (vehicle width direction) when the airbag 25 is fully inflated. The sub-inflating section 50 is positioned rearward (extending rearward and upward) from the conduit section 40 so as not to interfere with the conduit section 40 when the airbag 25 is fully inflated, viewed from the left and right sides. The sub-inflating section 50 has a generally rectangular shape that is wide in both the vertical directions and widely covers the left side of the lumbar region MW of the occupant MP from above and below. Specifically, the sub-inflating section 50 branches off in the region of the base-side section 44 of the conduit section 40, and distributes the airbag 25 to the left and right sides when the airbag 25 is fully inflated. (Vehicle width direction) When viewed from the front, the sub-inflating portion 50 is disposed at a position rearward of the bag main body 26 so as not to overlap with the bag main body 26 on the left-right direction (see FIGS. 5 and 9). Furthermore, the thickness dimension of the sub-inflating portion 50 upon completion of inflation is set to a dimension that causes the left wall portion 50a to contact the door trim DT and the right wall portion 50b to contact the waist region MW of the occupant MP upon completion of inflation (see FIG. 8).

[0019] The airbag 25 of this embodiment is formed into a bag shape by joining (sewing) the peripheral edges of a base fabric of a predetermined shape. Specifically, as shown in Figures 6 and 7, the airbag 25 is composed of an occupant-side panel 55 and a front-side panel 60 that constitute the bag main body 26, and two conduit panels 65, 70 that constitute the conduit 40 and the sub-inflatable section 50. The occupant-side panel 55, the front-side panel 60, and the conduit panels 65, 70 are each formed from flexible woven fabric made of polyester yarn, polyamide yarn, or the like.

[0020] The occupant-side panel 55 is disposed on the occupant MP side when inflation is complete and constitutes the region from the thigh contact surface 37 to the upper body restraint surface 36. The occupant-side panel 55 has a rear wall constituent portion 56 that mainly constitutes the rear wall portion 29 and a lower wall constituent portion 57 that mainly constitutes the lower wall portion 30, and has an outer shape such that the rear wall constituent portion 56 and the lower wall constituent portion 57 are connected at their lower rear ends when inflation is complete. The rear wall constituent portion 56 constitutes the rear wall portion 29 and the rear regions of the left wall portion 31 and the right wall portion 32, and the lower wall constituent portion 57 constitutes the lower wall portion 30 and the lower regions of the left wall portion 31 and the right wall portion 32. The rear wall constituent portion 56 and the lower wall constituent portion 57 each have a substantially hexagonal outer shape. The front panel 60 mainly constitutes the front wall 28 of the bag body 26 when fully inflated, and more specifically, constitutes the front wall 28 and the front regions of the left wall 31 and right wall 32. The front panel 60 has a generally hexagonal outer shape, and more specifically, its outer shape is generally hexagonal, substantially matching the outer shape of the rear wall-constituting portion 56 and the lower wall-constituting portion 57 when the bag is laid out flat with the remaining outer edges 56c, 57c spaced apart and the lower left edge 56a and rear left edge 57a, and the lower right edge 56b and rear right edge 57b joined together. The occupant-side panel 55 and the front panel 60 are bilaterally symmetrical. The bag body 26 is made bag-shaped by joining the outer edges 56c, 57c of the occupant side panel 55 (rear wall component 56, lower wall component 57) with the lower left edge 56a and rear left edge 57a joined together, and the lower right edge 56b and rear right edge 57b joined together, to the outer peripheral edge 60a of the front panel 60.

[0021] Conduit panel 65 constitutes upper wall 41 and sub-inflatable section 50 of conduit 40, and conduit panel 70 constitutes lower wall 42 of conduit 40. As shown in Fig. 7A, conduit panel 65 is configured so that sub-inflatable section 50-constituting section 67 is interposed between upper wall-constituting section 66 that constitutes upper wall 41, and sub-inflatable section 50 is formed by folding sub-inflatable section 67 in half and joining corresponding edge sections 67a, 67b. Furthermore, the outer shape of upper conduit panel 65 when sub-inflatable section 50 is formed (outer shape of upper wall-constituting section 66) is substantially the same as that of lower conduit panel 70, as shown in Fig. 7B.

[0022] In the occupant protection device S of the embodiment, when the inflator 17 is activated while the occupant MP is seated in the seat 1 mounted in the vehicle while fastening the seat belt 7, the inflation gas discharged from the inflator 17 flows into the bag body 26 via the conduit portion 40, causing the bag body 26 to break the cover 22 and protrude forward and upward from the lap belt 10, completing inflation as shown by the two-dot chain line in Figure 3 and Figures 8 and 9.

[0023] In the occupant protection device S of the embodiment, the airbag 25 has a sub-inflating section 50 that is configured to branch off from the conduit section 40 and inflates to fill the space between the waist region MW of the occupant MP and a vehicle body member (the door trim DT in this embodiment) that is disposed on the outer side (left side) of the seat 1, and upon completion of inflation, this sub-inflating section 50 comes into contact with the door trim DT and the vicinity of the waist region MW of the occupant MP without interfering with the conduit section 40. That is, in the occupant protection device S of the embodiment, upon completion of inflation of the airbag 25, the sub-inflating section 50 is interposed between the area near the waist region MW of the occupant MP and the door trim DT as a vehicle body member so as to come into contact with both of them. In the embodiment of the occupant protection device S, the airbag 25 is configured to inflate so that, when an average-sized male (equivalent to an AM50 dummy) MP1 is seated, the left-right center of the bag body 26 is positioned approximately in line with the left-right center of the upper body MU of the occupant MP1, as shown in Figures 8 and 9. Therefore, when a small occupant MP2 (equivalent to an AF05 dummy), such as a woman, is seated, the tip of the conduit portion 40 is positioned inward (to the right) in the vehicle width direction from the left-right center of the seat 1, and as shown in A of Figure 10, the bag body 26 is inflated with its left-right center shifted inward (to the right) in the vehicle width direction from the left-right center of the small occupant MP2. However, in the occupant protection device S of the embodiment, even if the bag main body 26 inflates misaligned with respect to the occupant MP2, the occupant MP2 (in this embodiment, the waist region MW of the occupant MP2) is pressed inward in the vehicle width direction (to the right) by the auxiliary inflation section 50 supported by the door trim DT. Furthermore, because the auxiliary inflation section 50 is positioned so as not to interfere with the conduit section 40, it can accurately press the occupant MP2 when inflation is complete. Therefore, as shown in FIG. 10B, the auxiliary inflation section 50 can move the occupant MP2 inward in the vehicle width direction (to the right) so as to approach the inflated bag main body 26, and the bag main body 26 can accurately protect the occupant MP2.

[0024] Therefore, the occupant protection device S of the embodiment can adequately protect even a small occupant MP2 seated in the seat.

[0025] Specifically, in the occupant protection device S of the embodiment, the sub-inflating portion 50 is configured to inflate at a position shifted rearward from the conduit portion 40 when viewed from the left or right side (see FIG. 9 ). The position of the sub-inflating portion is not limited to that of the embodiment as long as it does not interfere with the conduit portion when fully inflated. For example, the sub-inflating portion may be configured to be positioned shifted forward and downward from the conduit portion when viewed from the left or right side. When the sub-inflating portion is positioned in such a position, the sub-inflating portion covers the sides of the occupant's thighs and presses against the occupant's thighs without interfering with the conduit portion when fully inflated. Furthermore, from the perspective of accurately pressing against the occupant, it is desirable to position the sub-inflating portion at a position that is separated from the airbag body and does not overlap with the airbag body when the airbag is fully inflated when viewed from the left or right side.

[0026] Although detailed illustrations are omitted for the occupant protection device of the embodiment, conversely, when a large-built male (equivalent to an AM95 dummy) is seated, the tip of the conduit portion will be positioned outward (leftward) of the center in the vehicle width direction, and the bag body will inflate with the center of the bag body shifted outward in the vehicle width direction from the center of the occupant's left and right sides. Even when such a large occupant is seated, the sub-inflation portion will be filled and positioned between the occupant's waist and the vehicle body member when the airbag is fully inflated, pushing the occupant toward the inside of the vehicle width direction. However, because a large occupant is heavy, they will not move easily even when the inflated sub-inflation portion comes into contact with them, and even if they do move, the amount of movement will be small, and the effect of the sub-inflation portion will be negligible. Conversely, because small occupants are relatively light, they are easily moved by contact with the sub-inflatable portion supported by a vehicle body member such as the door trim. The present invention takes this into consideration and has been made to provide adequate protection for small occupants.

[0027] In the occupant protection device S of the embodiment, the distal end (tip end portion 45) of the conduit 40 is attached to the lap belt 10 by sewing it directly to the lap belt 10, which results in significant differences in the position of the bag body at the time of complete inflation due to differences in the occupant's physique. The conduit does not have to be sewn directly to the lap belt; for example, the conduit may be attached to the lap belt via an insertion member through which the lap belt can be inserted. Even with this configuration, although the conduit is somewhat movable relative to the lap belt, it is not capable of absorbing differences in the position of the bag body due to differences in the occupant's physique, and the same problem will arise. [Explanation of symbols]

[0028] 1...seat, 7...seat belt, 10...lap belt, 17...inflator, 25...airbag, 26...bag body, 40...duct portion, 40a...left end (base portion), 40b...right end (tip portion), 50...auxiliary inflation portion, DT...door trim (vehicle body side member), MP (MP1, MP2)...occupant, MW...waist portion, S...occupant protection device.

Claims

[Claim 1] It is configured to protect the occupant seated in the seat, Seat belts and an airbag attached to a lap belt in the seat belt, which restrains the waist of the occupant when the seat belt is fastened, and which inflates to cover the front of the occupant when activated; an inflator that supplies inflation gas to the airbag; The configuration is such that The airbag, a bag body that is disposed to cover the front of the occupant when inflation is complete; a conduit portion extending from an outer side of the seat in the vehicle width direction and disposed substantially along the lap belt, the conduit portion having a base side connected to the inflator and a tip side connected to the bag body at a lower surface side of the bag body, and configured to allow the inflation gas discharged from the inflator to flow into the bag body; An occupant protection device having a configuration comprising: The conduit portion is configured to pass through an upper surface side of the lap belt when the airbag is fully inflated, the airbag is configured to include a sub-inflating section that branches off from the conduit section and is inflatable to fill an area between the vicinity of the occupant's waist and a door trim that is a vehicle body side member of the vehicle and is disposed on the outer side of the seat in the vehicle width direction, the sub-inflation section extends rearward and upward from the conduit section without interfering with the conduit section when the airbag is fully inflated, so that it can come into contact with the door trim and the area around the waist; and the sub-inflation section is disposed at a position rearward of the bag body so as not to overlap with the bag body when the airbag is fully inflated, as viewed from the vehicle width direction.

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