Occupant protection devices

Abstract

To provide an occupant protection device having an air bag movable on a lap belt part in which the occupant can easily locate a position of the air bag.SOLUTION: An occupant protection device 10 comprises: a seat belt 11; a bag assembly 29 which includes an air bag 30 and is assembled to be slidable in a right and left direction of a seat relative to a lap belt part 13 of the seat belt 11; and an inflator which supplies the air bag 30 with inflation gas. The bag assembly 29 is arranged, when a tongue is connected to a buckle, at one side in the right and left direction and includes a projection 59a projecting in an occupant M side and a projection 59b arranged at the other side in the right and left direction and projecting in the occupant M side.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] Seat belts have been widely used to protect occupants seated in seats. Patent Document 1 describes a configuration in which an airbag is provided in a lap belt that restrains the occupant's waist when the seat belt is fastened. [Prior art documents] [Patent documents]

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

[0004] To maximize airbag performance, it is desirable to position the airbag directly in front of the occupant. However, because occupants vary in size, if the airbag's position relative to the lap belt is fixed, the airbag's target position may not be directly in front of every occupant. Therefore, it is possible to design the airbag so that it can slide along the lap belt. This allows the occupant to adjust the airbag's position, making it easier to position the airbag directly in front of each occupant.

[0005] However, even if the airbag is configured to slide on the lap belt portion in this manner, if the occupant does not adjust the position of the airbag sufficiently, the airbag may not be positioned in the desired position directly in front of the occupant, and the airbag may not perform to its full potential.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an occupant protection device that includes an airbag that is movable on a lap belt portion, and that allows an occupant to easily position the airbag. [Means for solving the problem]

[0007] A representative configuration of the present invention for solving the above-mentioned problems is an occupant protection device for protecting an occupant seated in a seat, comprising: a seat belt having at least a tongue, a buckle to which the tongue is connected, and a lap belt portion that restrains the waist of the occupant seated in the seat when the tongue is connected to the buckle; an airbag module that is folded and stored and includes an airbag that inflates to protect the occupant, and is assembled to the lap belt portion so as to be slidable in the left-right direction of the seat; and an inflator that supplies inflation gas to the airbag, wherein when the tongue is connected to the buckle, the airbag module has a first protrusion that is located at one end in the left-right direction and protrudes toward the occupant, and a second protrusion that is located at the other end in the left-right direction and protrudes toward the occupant.

[0008] According to the present invention, an airbag module configured to slide on a lap belt portion has a first protrusion and a second protrusion that protrude toward the occupant at one end and the other end, respectively. This allows the occupant to easily adjust the position of the airbag when fastening the seat belt so that the center of the occupant's body is positioned between the first protrusion and the second protrusion. This allows the occupant to easily position the airbag.

[0009] In addition, in the present invention, when the tongue is connected to the buckle, it is preferable that the amount of protrusion of each of the first protrusion and the second protrusion toward the occupant increases from the center toward the end toward the left and right direction of the airbag module.

[0010] With this configuration, the first protruding portion and the second protruding portion can more easily fit around the waist of the occupant, thereby improving the comfort of the occupant.

[0011] In addition, in the present invention, it is preferable that the airbag module comprises the airbag, a connecting member that holds the airbag and is connected to the lap belt portion so as to be slidable in the left-right direction, and a storage member that houses the airbag and the connecting member in a folded state and is connected to the lap belt portion so as to be slidable in the left-right direction, and that the storage member has the first protrusion and the second protrusion.

[0012] With this configuration, in the airbag module, the first protrusion and the second protrusion are provided on the housing member that is located closer to the occupant than the airbag and the connecting member, making it easier for the occupant to recognize the first protrusion and the second protrusion visually or tactilely.

[0013] Preferably, the first protrusion and the second protrusion are made of an elastic material.

[0014] With this configuration, when the first protrusion and the second protrusion come into contact with the occupant, they elastically deform to increase the contact area, thereby improving the contact between the first protrusion and the second protrusion and the occupant. Also, the occupant's foreign body sensation is alleviated, improving the comfort of the occupant.

[0015] The elastic body is preferably attached to the inner circumferential surface of the accommodating member in the portion on the occupant side.

[0016] With this configuration, the elastic body is not exposed to the outside of the housing member, and therefore, the design of the housing member is not impaired. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of a seat equipped with an occupant protection device. [Figure 2]FIG. 2 is a left side view of a seat equipped with an occupant protection device. [Figure 3] 1 is a front view of a seat equipped with an occupant protection device, showing an occupant seated in the seat with a seat belt fastened, and an inflated airbag indicated by a two-dot chain line. [Figure 4] 1 is a left side view of a seat equipped with an occupant protection device, showing an occupant seated in the seat with a seat belt fastened and an airbag inflated. [Figure 5] 4 is a cross-sectional view of the bag assembly of the occupant protection device taken along the line AA shown in FIG. 3. FIG. [Figure 6] 1 is a perspective view of a bag assembly of an occupant protection device in an inflated state, seen from below, with the bag cover omitted. FIG. [Figure 7] FIG. 2 is a plan view of each member constituting a bag assembly of the occupant protection device. [Figure 8] 1 is a cross-sectional view of a bag assembly of an occupant protection device, in which an occupant wearing a seat belt is shown by a two-dot chain line. [Figure 9] FIG. 10 is a cross-sectional view showing another configuration of the bag assembly of the occupant protection device. [Figure 10] FIG. 10 is a cross-sectional view showing another configuration of the bag assembly of the occupant protection device. DETAILED DESCRIPTION OF THE INVENTION

[0018] The overall configuration of an occupant protection device 10 according to one embodiment of the present invention will be described below with reference to the drawings. The dimensions, materials, shapes, relative positions, and other details of the components described below are not intended to limit the scope of the present invention unless otherwise specified. In the following description, the left-right direction refers to the left and right directions as viewed from the perspective of an occupant M seated in a seat 1 equipped with the occupant protection device 10, and the front-rear direction refers to the front and rear directions as viewed from the perspective of the occupant M.

[0019] FIG. 1 is a perspective view of a seat 1 equipped with an occupant protection device 10. FIG. 2 is a left side view of the seat 1 equipped with the occupant protection device 10. FIG. 3 is a front view of the seat 1 equipped with the occupant protection device 10, showing a state in which an occupant M is seated in the seat 1 and fastening a seat belt 11, with an inflated airbag 30 indicated by a two-dot chain line. FIG. 4 is a left side view of the seat 1 equipped with the occupant protection device 10, showing a state in which an occupant M is seated in the seat 1 and fastening a seat belt 11, and the airbag 30 is inflated.

[0020] As shown in Figures 1 to 4, an occupant protection device 10 is mounted on a vehicle seat 1. The occupant protection device 10 comprises a seat belt 11, a bag assembly 29 having an airbag 30, and an inflator 24 that supplies inflation gas to the airbag 30. The seat 1 comprises a backrest 2 and a seat portion 5.

[0021] The seat belt 11 is configured so that its upper end 11a can be unwound from a retractor 15 provided inside the left edge of the upper end 3 of the backrest 2, near the left shoulder of an occupant M seated in the seat 1. The lower end 11b of the seat belt 11 is a fixed end that is fixed to an anchor member 17 provided on the left side of the seat 5. The seat belt 11 is made of a strip-shaped material woven from polyester fiber or the like that has good sliding properties.

[0022] A tongue 20 is provided in the middle of the seat belt 11. The tongue 20 is fastened (connected) to a buckle 19 provided on the right side of the seat bottom 5 of the seat 1. When the occupant M is seated in the seat 1 and the tongue 20 is fastened to the buckle 19, the seat belt 11 is fastened to the occupant M.

[0023] When the seat belt 11 is fastened to the occupant M, the shoulder belt portion 12 extends from the tongue 20 toward the retractor 15 and is positioned in front of the upper body MU of the occupant M, and the lap belt portion 13 extends from the tongue 20 toward the lower end 11b and is positioned in front of the waist MW of the occupant M, and is capable of restraining the waist MW. The occupant M can release the fastening state of the tongue 20 with respect to the buckle 19 and remove the tongue 20 from the buckle 19 by pressing a release button (not shown) provided on the buckle 19.

[0024] The retractor 15 also has a pretensioner mechanism 16 that is configured to stop the seat belt 11 from being pulled out suddenly, and to retract the pulled-out seat belt 11 in the event of a vehicle collision, etc. The pretensioner mechanism 16 is a general-purpose mechanism that activates a built-in gas generator to rotate the shaft around which the seat belt 11 is wound, thereby retracting the seat belt 11 instantly.

[0025] Inflator 24 includes a generally cylindrical inflator body 25 that discharges inflation gas, and a pipe portion 26 that extends from inflator body 25 and is bent into a generally L-shape, and is fixed to the rear side of bottom portion 5 of seat 1. Pipe portion 26 is connected to tip 47a of gas supply path portion 45, and is connected to gas supply path portion 45 by being fastened with clamp 27.

[0026] The bag assembly 29 serving as an airbag module includes the airbag 30, a bag connecting portion 52, a bag cover 59, and a gas supply passage portion 45. The gas supply passage portion 45 connects the airbag 30 to the inflator 24 and supplies inflation gas discharged from the inflator 24 to the airbag 30. In an uninflated state prior to deployment, the airbag 30 is stored in a folded state inside the bag cover 59. The detailed configuration of the bag assembly 29 will be described later.

[0027] Next, the protective operation of the occupant protection device 10 for the occupant M will be described. First, when a vehicle equipped with the occupant protection device 10 collides, the pretensioner mechanism 16 of the retractor 15 is activated, and the seat belt 11 worn by the occupant M is retracted to stabilize the seating position of the occupant M in the seat 1. As a result, the lap belt portion 13 of the seat belt 11 is retracted toward the tongue 20, and the shoulder belt portion 12 connected to the lap belt portion 13 is retracted toward the shoulders of the occupant M. Thereafter, the inflator 24 is activated, and inflation gas is supplied from the inflator main body 25 to the airbag 30 via the gas supply passage 45, causing the airbag 30 to inflate. As a result, the upper body MU of the occupant M, which is moving forward, is received by the airbag 30, and the occupant M is protected.

[0028] Next, the detailed configuration of the bag assembly 29 will be described. Fig. 5 is a cross-sectional view of the bag assembly 29 taken along line AA shown in Fig. 3. Fig. 6 is a perspective view of the bag assembly 29 seen from below with the airbag 30 inflated, with the bag cover 59 omitted. Fig. 7 is a plan view of the components that make up the bag assembly 29. Fig. 8 is a cross-sectional view of the bag assembly 29, with the occupant M fastening the seatbelt 11 indicated by a two-dot chain line.

[0029] 5 to 8, the bag assembly 29 includes an airbag 30, a bag connecting portion 52, a bag cover 59, and a gas supply passage portion 45. When fully inflated, the airbag 30 has a peripheral wall 31 that inflates to form a generally triangular prism shape when viewed from the side. The airbag 30 also includes a bottom wall portion 32 on the bottom side, a rear wall portion 33 on the rear side, a front wall portion 34 on the front side, and left and right side walls 35L, 35R. When fully inflated, the airbag 30 has a lower surface 32a of the bottom wall portion 32 that serves as a support surface that is supported by the thighs MF of the occupant M, and a rear wall portion 33 that serves as a receiving surface that receives the upper body MU of the occupant M as it moves forward.

[0030] Two inlets 40a, which are openings for allowing inflation gas to flow in from the gas supply passage 45, are provided near the rear edge 32b of the bottom wall 32 of the airbag 30. Vent holes 42, which are openings for discharging excess inflation gas that has flowed into the airbag 30, are provided on the front sides of the left and right side walls 35L, 35R.

[0031] The airbag 30 is formed from a bag base fabric, which is a bag material made of woven fabric formed by plain weaving polyester fibers or the like and coated with a coating material such as silicone to prevent gas leakage. The peripheral wall 31 of the airbag 30 is formed from two pieces of bag base fabric: a front region 31a that forms the bottom wall 32, the front wall 34, and the front sides of the left and right side walls 35L, 35R, and a rear region 31b that forms the rear wall 33 and the rear sides of the left and right side walls 35L, 35R.

[0032] The gas supply passage portion 45 includes a bag side portion 46 connected to the airbag 30, and a cylindrical gas flow passage portion 47 extending from the bag side portion 46 toward the inflator 24. A tip 47a of the gas flow passage portion 47 is connected to the pipe portion 26 of the inflator 24. The bag side portion 46 has a communication port 46a that communicates with the inlet 40a of the airbag 30, and the periphery of the communication port 46a is sewn to the periphery of the inlet 40a, whereby the bag side portion 46 is connected to the rear edge 32b of the bottom wall portion 32 of the airbag 30.

[0033] The gas supply passage 45 is formed by sewing together the outer peripheral edges of an outer material 49 on the lower surface side and a bag side material 50 on the airbag 30 side, which has the same outer dimensions as the outer material 49. The outer material 49 and the bag side material 50 are formed from the same base fabric as the bag base fabric that forms the airbag 30. Before sewing together the outer peripheral edges of the outer material 49 and the bag side material 50, the periphery of the communication port 46a of the bag side material 50 is sewn to the periphery of the inlet 40a of the airbag 30.

[0034] The bag connecting portion 52 as a connecting member is a member that connects the airbag 30 to the lap belt portion 13. The bag connecting portion 52 is a tubular member formed by joining ends 54a of a connecting portion material 54, which is a base fabric similar to the bag base fabric that forms the airbag 30, with a sewing thread 56. The bag connecting portion 52 is connected to the bag side portion 46 of the gas supply path portion 45 by sewing at a sewing portion 52b. In other words, the bag connecting portion 52 is not directly connected to the airbag 30, but is indirectly connected to the lower surface 32a of the airbag 30 via the gas supply path portion 45. In this way, the bag connecting portion 52 holds the airbag 30. Note that the bag connecting portion 52 may be directly sewn to the airbag 30 so that the bag connecting portion 52 directly holds the airbag 30.

[0035] The cylindrical bag connecting portion 52 has a space inside the cylinder and a belt insertion portion 52a through which the lap belt portion 13 is inserted. When the lap belt portion 13 is inserted through the belt insertion portion 52a, the bag connecting portion 52 is connected to the lap belt portion 13 so as to be slidable on the lap belt portion 13 along the longitudinal direction of the lap belt portion 13. As a result, the airbag 30 held by the bag connecting portion 52 is slidable on the lap belt portion 13.

[0036] By configuring the airbag 30 to be slidable on the lap belt portion 13 in this manner, the occupant M seated in the seat 1 and fastening the seat belt 11 can adjust the position of the airbag 30 to suit the occupant's individual physique by sliding the airbag 30 left and right on the seat 1. This makes it easier to position the center of the airbag 30, which is the target position of the airbag 30, directly in front of the occupant M, making it easier to demonstrate the performance of the airbag 30.

[0037] The bag cover 59, which serves as a containing member, contains the folded airbag 30, the bag side portions 46 of the gas supply passage 45, the bag connecting portion 52, and the portion of the lap belt portion 13 that is attached to the bag assembly 29. The bag cover 59 is formed into a cylindrical shape by stitching together ends 60a of a cover material 60 with a stitching thread 61, and contains the above-mentioned components inside the cylindrical shape. When the airbag 30 inflates, the bag cover 59 receives pressure from the airbag 30 and a portion of the bag cover 59 breaks, causing the airbag 30 to protrude from the bag cover 59. Since the bag cover 59 simply covers the lap belt portion 13, it is slidable over the lap belt portion 13. Unlike the material of the airbag 30, the cover material 60 is made of a fabric similar to that used for the seat material of the seat 1 so as not to impair the design.

[0038] Two urethane blocks 65a and 65b, which serve as elastic bodies for forming protrusions 59a and 59b (described later), are attached to the inner peripheral surface of the bag cover 59 on the occupant M side by adhesive, double-sided tape, hook-and-loop fastener, stitching, or other methods. When the occupant M has fastened the seat belt 11, the blocks 65a and 65b are located at one end and the other end of the bag cover 59 in the left-right direction of the seat 1, respectively, and are also located near one end and the other end of the seat 1 in the same direction.

[0039] Furthermore, when the occupant M is wearing the seat belt 11, the blocks 65a and 65b are shaped so that the thickness of the blocks 65a and 65b increases in the front-to-rear direction of the seat 1 from the center of the bag cover 59 toward the ends. In this embodiment, the blocks 65a and 65b are generally triangular when viewed vertically, and are bilaterally symmetrical. Specifically, the block 65a has a mounting surface 65a1 that is attached to the inner circumferential surface of the bag cover 59, a belt contact surface 65a2 that contacts the lap belt portion 13, and another surface 65a3. The generally triangular shape has three vertices: a vertex 65a4 formed by the mounting surface 65a1 and the belt contact surface 65a2, a vertex 65a5 formed by the mounting surface 65a1 and the other surface 65a3, and a vertex 65a6 formed by the belt contact surface 65a2 and the other surface 65a3, and these three vertices are chamfered. Similarly, block 65b has a mounting surface 65b1 that is attached to the inner circumferential surface of bag cover 59, a belt contact surface 65b2 that contacts lap belt portion 13, and another surface 65b3. Block 65b has a generally triangular shape with three vertices: vertex 65b4 formed by mounting surface 65b1 and belt contact surface 65b2, vertex 65b5 formed by mounting surface 65b1 and other surface 65b3, and vertex 65b6 formed by belt contact surface 65b2 and other surface 65b3, and these three vertices are chamfered. In this embodiment, inexpensive urethane is used as the material for blocks 65a and 65b, but the present invention is not limited to this, and blocks 65a and 65b made of other materials may also be used.

[0040] By attaching the blocks 65a, 65b to the inner peripheral surface of the bag cover 59 in this manner, the bag cover 59 forms protruding portions 59a, 59b that protrude toward the occupant M. That is, as shown in FIG. 8 , the blocks 65a, 65b are disposed in contact with the lap belt portion 13. However, because the rigidity of the lap belt portion 13 is greater than that of the bag cover 59, the blocks 65a, 65b are pushed outward by the rigidity of the lap belt portion 13, thereby forming the protruding portions 59a, 59b on the bag cover 59. Furthermore, based on the shape of the blocks 65a, 65b, the protruding amounts of the protruding portions 59a, 59b toward the occupant M increase from the center toward the ends of the bag cover 59 in the left-right direction of the seat 1. In this embodiment, the protruding amounts of the vertices 65a5, 65b5, which are the most protruding portions of the protruding portions 59a, 59b, respectively, are approximately 5 cm.

[0041] Furthermore, by arranging the blocks 65a and 65b at the above-described positions, the protrusions 59a and 59b are arranged at the following positions. That is, the protrusion 59a as the first protrusion is arranged at one end of the bag cover 59 in the left-right direction of the seat 1 and near one end of the seat 1 when the occupant M is fastening the seat belt 11. The protrusion 59b as the second protrusion is arranged at the other end of the bag cover 59 in the left-right direction of the seat 1 and near the other end of the seat 1 when the occupant M is fastening the seat belt 11. Furthermore, the center position of the airbag 30 is set to be arranged near the center of an imaginary line connecting the protrusions 59a and 59b.

[0042] Here, one end side and the other end side of the bag cover 59 refer to one side and the other side of the center of the bag cover 59 in the left-right direction of the seat 1 when the occupant M is wearing the seat belt 11. From the viewpoint of simplifying the position adjustment of the airbag 30 by the occupant M, which will be described later, the distance between the protrusions 59a and 59b in the left-right direction of the seat 1 is preferably set to approximately 400 mm to 550 mm, and is set to approximately 500 mm in this embodiment. From the same viewpoint, it is also preferable to position the protrusions 59a and 59b near each end of the seat 1 in the left-right direction, within 150 mm from each end of the seat 1 in the left-right direction.

[0043] When assembling the bag assembly 29 to the lap belt portion 13, first, the gas supply path 45, to which the bag connecting portion 52 is connected before being formed into a cylindrical shape, is connected to the airbag 30, and the airbag 30 is folded. Next, the bag connecting portion 52 encases the portion of the lap belt portion 13 to which the bag assembly 29 is to be attached, forming the bag connecting portion 52 into a cylindrical shape. After that, the folded airbag 30 and other components are encased together with the lap belt portion 13 by a bag cover 59, and the bag cover 59 is formed into a cylindrical shape. In this manner, the bag assembly 29 can be assembled to the lap belt portion 13. Thereafter, the pipe portion 26 of the inflator 24 and the tip 47a of the gas flow path portion 47 of the gas supply path 45 are connected using the clamp 27, and the bag assembly 29 can be mounted on the seat 1.

[0044] Next, a method for the occupant M to adjust the position of the airbag 30 will be described. First, the occupant M sits in the seat 1 and fastens the tongue 20 into the buckle 19 while unwinding the seatbelt 11 from the retractor 15 to put on the seatbelt 11. Next, if the center of the airbag 30 is not located in the center of the occupant M's upper body MU, the occupant M slides the bag assembly 29 on the lap belt portion 13 to adjust the position of the airbag 30 so that the center of the airbag 30 is located in the center of the occupant M's upper body MU. At this time, the occupant M visually or tactilely recognizes the protrusions 59a and 59b, and adjusts the position of the bag assembly 29 so that the center of the upper body MU is located in the center of an imaginary line connecting the protrusions 59a and 59b, thereby roughly aligning the center of the upper body MU with the center of the airbag 30. As described above, the configuration of this embodiment allows the occupant M to easily position the airbag 30.

[0045] Furthermore, the amount of protrusion of each of protrusions 59a and 59b toward occupant M increases from the center of bag cover 59 toward the ends in the left-right direction of seat 1. With this configuration, protrusions 59a and 59b can more easily fit around the waist of occupant M, thereby improving the comfort of occupant M.

[0046] Furthermore, the protrusions 59a, 59b are formed of an elastic body. As a result, when the protrusions 59a, 59b come into contact with the occupant M, they are elastically deformed, increasing the contact area between the protrusions 59a, 59b and the occupant M, thereby improving the contact between the protrusions 59a, 59b and the occupant M. This also reduces the foreign body sensation felt by the occupant M, improving the comfort of the occupant M.

[0047] Additionally, blocks 65a, 65b for forming protrusions 59a, 59b are attached to the inner peripheral surface of bag cover 59. With this configuration, blocks 65a, 65b are not exposed to the outside, which prevents the design of bag cover 59 from being impaired.

[0048] Furthermore, the protrusions 59a and 59b are provided on the bag cover 59, which is located closer to the occupant M than the airbag 30 and the bag connecting portion 52 that constitute the airbag module. This makes it easier for the occupant M to recognize the protrusions 59a and 59b visually or tactilely.

[0049] Although the present embodiment describes a configuration in which the protrusions 59a, 59b are formed on the bag cover 59 by attaching the blocks 65a, 65b to the inner peripheral surface of the bag cover 59, the present invention is not limited to this. For example, as shown in FIG. 9 , the protrusions 59a, 59b may be formed by attaching the blocks 65a, 65b to the outer peripheral surface of the bag cover 59 in a manner similar to that described above. This allows the protrusions 59a, 59b to be easily provided by attaching the blocks 65a, 65b to an existing bag assembly 29. Furthermore, as shown in FIG. 10 , the length of the bag connecting portion 52 in the left-right direction of the seat 1 may be made longer than in the above configuration, and the protrusions 59a, 59b may be formed by attaching the blocks 65a, 65b to the bag connecting portion 52 in a manner similar to that described above. Even with such a configuration, the same effects as those described above can be obtained.

[0050] In addition, in this embodiment, the occupant protection device 10 has been described using as an example a so-called three-point seat belt 11 in which the seat belt 11 has the shoulder belt portion 12 and the lap belt portion 13, but the present invention is not limited to this. That is, even if the present invention is applied to a so-called two-point seat belt 11 in which the seat belt 11 does not have the shoulder belt portion 12 but has the lap belt portion 13, the same effects as those described above can be obtained. [Explanation of symbols]

[0051] 1...seat, 10...occupant protection device, 11...seat belt, 13...lap belt portion, 19...buckle, 20...tongue, 24...inflator, 25...inflator body, 26...pipe portion, 29...bag assembly, 30...airbag, 45...gas supply path portion, 52...bag connecting portion, 59...bag cover, 59a, 59b...projections, 65a, 65b...block, M...occupant, MW...waist

Claims

[Claim 1] An occupant protection device for protecting an occupant seated in a seat, a seat belt including at least a tongue, a buckle to which the tongue is coupled, and a lap belt portion that restrains a waist region of the occupant seated in the seat when the tongue is coupled to the buckle; an airbag module including an airbag that is folded and stored and inflates to protect the occupant, the airbag module being assembled to the lap belt portion so as to be slidable in the left-right direction of the seat; an inflator that supplies inflation gas to the airbag; Equipped with the airbag module has a first protruding portion that is disposed at one end in the left-right direction and protrudes toward the occupant when the tongue is connected to the buckle, and a second protruding portion that is disposed at the other end in the left-right direction and protrudes toward the occupant, The occupant protection device according to claim 1, wherein the first protrusion and the second protrusion are configured so as not to be deformed by the inflation gas supplied from the inflator.

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