JP2000189274A - Seat for vehicle and manufacture of seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for a vehicle and the manufacturing method of the seat for the vehicle capable of accurately and easily disposing a waterproof film between a facing material and a cushion material and surely preventing water and dust, etc., from intruding from the sewing part of the facing material. SOLUTION: In this seat for a vehicle for which a cushion material 20 is covered with a facing material 10, the facing material 10 is formed by joining the facing material 10a including a seat surface part area and the facing material 10b not including the seat surface part area and a recessed groove 22 is formed on a seat surface part area side from a joining line at a prescribed position including the joining line on the ridge line side of the cushion material. Then, between the facing material 10 and the cushion material 20, the waterproof film 21 is disposed from the side of the facing material 10b not including the seat surface part area to the position of the recessed groove 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat, and more particularly to a vehicle seat used outdoors and a method for manufacturing the vehicle seat. The present invention relates to a vehicle seat and a method for manufacturing the vehicle seat.

[0002]

2. Description of the Related Art Conventionally, a vehicle seat is formed by, for example, arranging a cushion material on a bottom plate and covering with a skin. As a vehicle seat, a seat having an uneven portion shape has been proposed, particularly in consideration of designability, riding comfort, and the like. For example, as a technique for manufacturing a sheet having an uneven portion shape, as shown in FIG. 10, a concave line is formed in a cushion material 120, and a skin material 110 is moved to a bottom plate 130 side by a hanging tool (a hanging string) 140. There is known a technique of suspending and a technique of covering a cushion material 120 with a skin material 110 as shown in FIG. The skin material 110 is formed to have an uneven shape by sewing a plurality of skin material pieces in order to obtain a three-dimensional shape.

In the case of the technique in which the cushion material 120 is covered with the skin material 110, it is necessary to prevent water, dust, and the like from entering the cushion material 120 from the joint portion of the skin material 110 obtained by sewing the plurality of skin materials 110. There is. For this reason, a waterproof film (not shown) is provided between the skin material 110 and the cushion material 120, and the waterproof film prevents rainwater or the like from entering.

[0004]

In the technique using the waterproof film as described above, it is possible to reliably prevent water, dust and the like from entering the joint by arranging the waterproof film at an appropriate position. Therefore, it is necessary to accurately arrange the waterproof film.

Further, in a vehicle seat formed by covering a cushion material 120 with a skin material 110 by sewing,
As shown in FIG. 11, floating easily occurs between the skin material 110 and the cushion material 120 in the concave and convex portions, particularly, the concave portions. There are technologies to prevent this.

When an adhesive is applied between the skin material 110 and the cushion material 120, if the waterproof film is not arranged at an appropriate position, the waterproof film enters the adhesive application area, and the adhesive is applied. However, there is a problem in that the adhesive adheres to the adhesive and causes a twist, or the waterproof film is caught between the adhesive and the skin material 110, thereby hindering the adhesion between the skin material 110 and the cushion material 120.

[0007] For this reason, it is necessary to cut the waterproof film accurately at an accurate position. However, there is a problem that the work while confirming the cut position is troublesome and cannot be performed efficiently.

An object of the present invention is to provide a waterproof film between a skin material and a cushion material easily and accurately, and to reliably prevent water, dust and the like from entering from a seam portion of the skin material. It is an object of the present invention to provide a vehicular seat and a method of manufacturing the vehicular seat.

[0009]

The object of the present invention is to provide a vehicle seat in which a cushioning material is covered with a skin material, wherein the skin material includes a skin material including a seat surface region and a skin material not including a seat surface region. A groove is formed at a predetermined position including a joint line on the ridge line side of the cushion material, a concave groove is formed on the seat surface region side from the joint line, and between the skin material and the cushion material This is solved by disposing the waterproof film from the skin material side not including the seat surface region to the position of the concave groove.

As described above, in the vehicle seat according to the present embodiment, the concave groove is formed at a predetermined position including the joint line on the ridge line side of the cushion material, and the groove is formed on the seat surface region side of the joint line. As a guideline, by arranging the waterproof film from the skin agent side not including the seat surface region to the position of the concave groove, the waterproof film can be easily arranged at an appropriate position.

In this case, it is preferable that the skin material is formed by sequentially laminating a synthetic resin sheet, a base cloth, and a synthetic resin foam. More specifically, the skin material is formed by sequentially laminating a PVC to which a surface treatment material has been applied, a base fabric made of a knitted fabric with nylon yarn, and a synthetic resin foam. The synthetic resin foam is preferably a closed-cell foam, for example, a PVC foam.

[0012] With the above construction, the synthetic resin foam can prevent the plasticizer contained in the synthetic resin from migrating to the cushion material side, and the seating feeling deteriorates due to partial curing of the skin material side. This has the effect of preventing the inconvenience of doing so. In addition, the presence of the synthetic resin foam causes the amine catalyst contained in the cushioning material to migrate to the skin material side, discoloring or fading the synthetic resin, thereby deteriorating the aesthetic appearance of the sheet. This has the effect that it can be prevented.

[0013] Further, since the surface treatment material is applied to the skin material, it is possible to suppress the gloss of the surface and to give the appearance a profound feeling, and by squeezing the skin material, the surface of the sheet is made leather. As a touch, a high-quality good vehicle seat can be provided. Furthermore, by using a vinyl acrylate copolymer resin or a vinyl methacrylate copolymer resin as the surface treatment material, high-frequency welding can be performed, and the skin materials can be joined together, and the skin end can be fixed to the bottom plate or frame. Can be performed reliably and efficiently.

It is preferable that the skin material and the cushion material are joined by an adhesive. By joining with an adhesive in this manner, the assembling work with the skin material is facilitated. Preferably, the adhesive is applied to both or at least one of the skin material and the cushion material.

[0015] The above-mentioned adhesive is used except for the sheet front end side.
It is preferable that the coating be applied to a region inside the ridgeline of the seat surface. As described above, by setting the adhesive application range to the inner region of the ridge line of the cushion material, the skin material is not fixed at the ridge line portion where the load is most applied. This can prevent the occurrence of the vehicle seat and obtain a vehicle seat having a good appearance.

Further, the method for manufacturing a vehicle seat is a method for manufacturing a vehicle seat comprising a cushion material covered with a skin material, wherein the cushion material has a side facing the skin material and a ridge line side of the cushion material. At a predetermined position including the joining line, a step of forming a concave groove on the seat surface region side from the joining line, a step of attaching a waterproof film to the cushion material, and a step of cutting the waterproof film along the concave groove A step of applying an adhesive to a contact surface between the cushion material and the skin material, a step of crimping the skin material and the cushion material, and a step of covering the cushion material with the skin material, It is characterized by having.

As described above, in the method for manufacturing a vehicle seat according to the present invention, the cushion material is provided with the concave groove, and the waterproof film is cut along the concave groove by using the concave groove as a guideline. Can be arranged at an appropriate position, and work efficiency is improved.

Alternatively, a method of manufacturing a vehicle seat is a method of manufacturing a vehicle seat in which a cushion material is covered with a skin material, wherein the cushion material has a surface facing the skin material and a ridge line side of the cushion material. At a predetermined position including the joining line, a step of forming a concave groove on the seat surface region side from the joining line, a step of attaching a waterproof film to the cushion material, and a step of cutting the waterproof film along the concave groove A step of vacuum forming the skin material, a step of applying an adhesive to a contact surface between the cushion material and the skin material, and a step of integrally forming the skin material and the cushion material, Covering the cushion material with a skin material.

By vacuum forming the skin material as described above, it is possible to cope with a cushion material having a severe unevenness, and it is possible to secure design freedom and functionality.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION As a vehicle seat of the present invention, for example, a motorcycle seat S, a cushion material 20 is disposed on a bottom plate 30 and the cushion material 20 is used as a skin material 10.
It is configured to be covered with. Further, the skin material 10 is formed by joining a skin material 10a including the seat surface region and a skin material 10b not including the seat surface region.

A joining line 10c where the skin material 10a and the skin material 10b are joined on the ridge line 23 side of the cushion material 20.
The groove 22 is formed at a predetermined position including on the side of the seating surface region with respect to the joining line 10c. And a skin material 10,
Between the cushion material 20 and the surface of the skin material 10 b not including the seat surface region, the waterproof film 21
Are arranged.

The skin material 10 is formed by sequentially laminating a synthetic resin sheet, a base cloth, and a synthetic resin foam which is a foam of closed cells. More specifically, the skin material 10
Is a PVC 12 to which a surface treatment material 11 has been applied, a base fabric 13 made of a knitted fabric of nylon yarn, and a PVC foam 14
Are sequentially laminated. Surface treatment material 11
Is made of, for example, a vinyl chloride acrylate copolymer resin or a vinyl methacrylate copolymer resin.

The skin material 10 and the cushion material 20 are joined by an adhesive 40, and the adhesive 40 is applied to both or at least one of the skin material 10 and the cushion material 20. The application range of the adhesive 40 depends on the cushion material 20.
Inside region 50 of the ridge line 23 of FIG.

The method for manufacturing a vehicle seat includes the following steps. First, on the side of the cushion material 20 facing the skin material 10, on the ridgeline 23 side of the cushion material 20,
At a predetermined position including the joining line 10c, the concave groove 23 is formed on the side of the seat surface region with respect to the joining line 10c.

The waterproof film 2 is provided on the cushion material 20.
Attach 1. Further, the waterproof film 21 is cut along the concave groove 23. Next, the cushion material 20 and the skin material 10
The adhesive 40 is applied to the contact surfaces with the
And the cushion material 20 are pressed. Finally, the skin material 10
To cover the cushion material 20.

Alternatively, a concave groove 23 is formed in the cushion material, a waterproof film 21 is attached to the cushion material 20, and the waterproof film 21 is cut along the concave groove 23, and the skin material 10 is cut.
Is vacuum-formed, an adhesive 40 is applied to the contact surface between the cushion material 20 and the skin material 10, respectively, and the skin material 10 and the cushion material 20 are integrally formed, and the cushion material 20 is covered with the skin material 10. It is good as a method.

[0027]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view showing a vehicle seat of the present invention.
2 is a cross-sectional view taken along the line AA of FIG. 1, and is a cross-sectional view showing the structure of the skin material, FIG. 3 is a perspective view showing the cushion material, FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 6 is an enlarged sectional view of a groove portion of a vehicle seat.

In this embodiment, a description will be given of a motorcycle seat S as a vehicle seat. In this specification,
The vehicle seat includes not only a land-based motorcycle and a scooter but also a snowmobile and a personal watercraft, and also includes a three-wheeled buggy or the like, a straddle-type vehicle, or a vehicle seat related to a construction machine seat.

The motorcycle seat S of this embodiment is a motorcycle seat in which a cushion material 20 is provided on a bottom plate 30 and the cushion material 20 is covered with a skin material 10. That is, the cushion material 20 is placed on the bottom plate 30, the cushion material 20 is covered with the skin material 10, and the end of the skin material 10 is fixed on the back surface side of the bottom plate 30.

The skin material 10 includes the skin material 1 including the seat area.
By suturing the skin material 10a and the skin material 10b not including the seating surface region, the skin material 10b is formed so as to conform to the three-dimensional shape of the cushion material 20, and the cushion material 20 can be covered. The joint between the skin material 10a including the seat surface region and the skin material 10b not including the seat surface region is connected to a joining line 10c.
And

Next, the structure of the material of the skin material 10 will be described. FIG. 2 is a sectional view taken along line AA in FIG. The skin material 10 is formed by laminating a synthetic resin on the surface side, a base cloth, and a synthetic resin foam. That is, the synthetic resin and the synthetic resin foam are laminated with the base cloth interposed therebetween. As described above, the synthetic resin foam is present between the cushion material 20 and the synthetic resin and the base cloth. Synthetic resin foam is a closed cell foam.

As a more specific example, the skin material 10 is made of P as a synthetic resin to which the surface treatment material 11 has been applied.
VC12, base cloth 13, and PV as a synthetic resin foam
C foams 14 are sequentially laminated. Further, an arbitrary emboss (squeezing) is applied to the outer surface of the skin material 10, and the outer surface is formed in a leather touch. As the emboss, for example, a known press machine such as a lithographic press machine or a roll emboss machine, or an emboss machine can be used, and the uneven shape of the emboss plate is formed on the sheet by heat and pressure.

The surface treatment material 11 of this embodiment is made of a vinyl chloride acrylate copolymer resin or a vinyl chloride methacrylate copolymer resin.

The PVC 12 may be a composite of PVC and a protein powder having a particle size of 1 to 40 μm (for example, a fine powder of natural protein fiber). As the protein powder, a powder having a particle size of 3 to 8 microns, preferably 4 to 7 microns is used. This is skin material 10
This is to ensure uniform dispersion in the thickness of the PVC 11 that forms the surface layer.

The base fabric 13 of this embodiment is formed from a knitted fabric using nylon yarn. In this example, the PVC 1
An adhesive 13a is applied to the contact surfaces of the PVC foam 2 and the PVC foam 14, respectively, and are molded integrally with the PVC 12 and the PVC foam 14.

The PVC foam 14 of the present embodiment is a crosslinked one, and uses an independent foam. In this embodiment, an example in which PVC is used as the synthetic resin foam is shown, but in addition to PVC, PE foam (polyethylene foam) and PP foam (polypropylene foam) can be used as the foam. . In this case, it is also possible to use a closed cell foam or a foam containing closed cells.

In this embodiment, the adhesive 13a is applied to the base cloth 13 and the PVC 12, the base cloth 13, and the PVC foam 14 are laminated. However, the present invention is not limited to the method of applying the adhesive 13a to the base cloth 13. , PVC 12, the base fabric 13, and the PVC foam 14 may be laminated by other known techniques. Further, when laminating, it is also possible to join the above members to each other by high frequency welding. A predetermined processing line can also be formed by performing high-frequency welding in this manner.

The skin material 10 is composed of a skin material 11 made of a vinyl chloride acrylate copolymer resin or a vinyl chloride methacrylate copolymer resin, or a high-frequency weldable material such as PVC12. In this case, high frequency welding can be easily performed at the joint portion of the skin material, and the joint can be efficiently and reliably provided with strength.

Further, in the skin material 10 of this embodiment, since the closed-cell foam is present between the synthetic resin and the base cloth and the cushion material 20, the plasticizer contained in the synthetic resin contains the plasticizer. The seat does not harden and the seating feeling is not degraded, and a good motorcycle seat can be obtained.

Further, in the skin material 10, since the closed cell foam is present between the synthetic resin and the cushion material, the amine catalyst contained in the cushion material does not come into direct contact with the synthetic resin. It is possible to solve the conventional problems of fading and impairing the aesthetic appearance of the sheet.

Further, the skin material of the motorcycle seat having the above-described structure sufficiently retains the leather texture due to the presence of the foam. Also, by stacking a foam with cushioning properties on top of the cushioning material, the property of cushioning is generated, so the rider's feeling of bottoming is eased and the seat's weatherability against wind and rain etc. is improved. Having.

Next, the cushion member 20 of this embodiment will be described. The cushion material 20 of the present example is formed from urethane foam. As shown in FIG. 3, the cushioning material 20 of the present embodiment has a waterproof film 21 adhered to a position corresponding to the joint of the skin material.

FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, and shows a cross section of the cushion material 20 on the right side of line bb in FIG. As shown in FIG. 4 and FIG. 5, the skin material 10 a and the skin material 10
A concave groove 22 is formed at a predetermined position including the joining line 10c where b is joined to the seat surface region side from the joining line 10c.

The waterproof film 21 is provided using the groove 22 as a guideline. That is, the waterproof film 21 is cut at the position of the concave groove 22 as shown in FIG. As a result, the waterproof film 21 is
On the seat surface of the vehicle, and is disposed at an appropriate position without extending to the bonding surface 50 between the skin material 10 and the cushion material 20 described later.

In this embodiment, when the waterproof film 21 is cut, the cutting means such as scissors can be easily inserted.
Although the example in which the shape of the concave groove 22 is formed to have a substantially V-shaped cross section has been described, it is a matter of course that the present invention is not limited to this, and may be another shape such as a groove having a rectangular cross section or a substantially U-shaped groove.

In this embodiment, the cushion material 20 is made of a skin material.
When covering 10, it is joined by the adhesive 40.
The adhesive 40 is applied to both or at least one of the skin material 10 and the cushion material 20, and various types of adhesive can be used.

For example, as the adhesive 40, there is a hot-melt adhesive in the form of an adhesive film. This adhesive has an active double bond during hot-melt bonding, and is cured by ultraviolet rays or electron beams, epoxy or the like. Thermosetting with a group and a latent curing agent, thermosetting with NCO group and Si (OR) 3 group, curing with oxygen, SH group and metal oxide catalyst, etc. There is. Particularly, a urethane-based wet curing agent adhesive is preferable. As a specific example of the urethane-based wet curing agent adhesive, a moisture-curable hot melt adhesive containing a polyester-based isocyanate prepolymer as a main component, and a commercially available adhesive can be used.

Regarding the adhesion between the skin material 10 and the cushion material 20, in the motorcycle seat S of this embodiment, as shown in FIG.
Inside area.

Next, the bottom plate 30 will be described. The bottom plate 30 is formed of a synthetic resin in this example, and the cushion material 20 is placed on the synthetic resin bottom plate, and the cushion material 20 is attached to the skin material 10.
And the ends of the skin material 10 are fixed to the back surface of the bottom plate 30. Bottom plate 3
Although 0 is a synthetic resin in the above embodiment, the material is not limited thereto, and various materials may be used.

When fixing the end of the skin material 10 to the bottom plate 30, it is possible to fix the skin end with a fixing tool such as a staple or to perform a process by high frequency welding. That is, the skin material 10 of the present invention comprises a surface treatment material 11 made of a vinyl chloride acrylate copolymer resin or a vinyl chloride methacrylate copolymer resin,
Since it is made of a material capable of high frequency welding such as VC, it is possible to use means such as high frequency welding such as ultrasonic welding or high frequency welding. By employing high-frequency welding, terminal processing can be performed reliably and efficiently.

In this embodiment, the seat S for a motorcycle is described as an example. Therefore, the cushion material 20 is placed on the bottom plate 30 and the skin terminal is fixed to the bottom plate 30. In such a sheet, for example, a construction machine sheet, the cushion material is placed on the frame, and the terminal of the skin material 10 is fixed to the frame.

Next, a method for manufacturing the motorcycle seat S of the present invention will be described. First, an adhesive for bonding the waterproof film 21 is applied to the cushion material 20, and the waterproof film 21 is attached to the cushion material 20.

In this embodiment, the cushion member 20 is provided with the concave groove 2.
Since the groove 2 is formed, the waterproof film 21 is cut at the position where the groove 22 is formed, using the groove 22 as a guideline.

Further, the ridge line 23 of the cushioning material 20 seat surface portion
Is applied to the inner region 50 of the. The adhesive 40 is applied to both or at least one of the skin material 10 and the cushion material 20.

Finally, the skin material 10 and the cushion material 20 are press-bonded to cover the skin material 10 with the cushion material 20.
The terminal portion is subjected to a heat treatment or a tucker process to complete the motorcycle seat S.

In addition to the above-described manufacturing method, the skin material 10 is formed into an uneven shape by vacuum forming, and the cushion material 20 is formed.
It is good also as a method of joining. By forming the skin material 10 by vacuum forming, the skin material 10 can easily have an uneven shape.

Conventionally, when a motorcycle sheet S having a complicated uneven shape is formed, a plurality of skins are formed as shown in FIGS. By suturing the material 110, a three-dimensional shape was formed. However, by employing vacuum forming, even if the motorcycle sheet S has a complicated uneven shape as shown in FIG. 9, for example, the skin material 10 can easily have the uneven shape conforming to the sheet shape. Becomes possible.

FIG. 7 shows a skin material 1 formed by vacuum forming.
FIG. 8 shows a motorcycle seat S using the “0”.
FIG. 8 is a cross-sectional view taken along the line CC of FIG. 7, and shows a cross section of the motorcycle seat S on the right side of the line cc in the figure. As shown in FIG. 8, an adhesive 40 is applied to the skin material 10 formed into an uneven shape by vacuum forming, and a cushion member including the cushion material 20 and the bottom plate 30 is pressed into a mold to be fixed.

Alternatively, a method may be used in which the adhesive 40 is applied to the skin material 10 formed into an uneven shape in the mold frame, and then the urethane foam raw material is injected and foamed to form the foam.
By vacuum forming the skin material 10 in this manner, it is possible to cope with a cushion material having a severe unevenness, and it is possible to secure design freedom and functionality.

In the above embodiment, the motorcycle seat S for one-seater is described as the motorcycle seat S. However, a seat for two-seater as shown in FIG. 9 may be used, and the shape of the seat is not particularly limited.

[0062]

As described above, according to the present invention, the joining line between the skin material including the seat surface region and the skin material not including the seat surface region is provided on the side of the cushion material facing the skin material including the seat surface region. Since a concave groove is formed along the joining line at a position separated by a predetermined distance from, the waterproof film is arranged from the skin agent side not including the seat surface region to the position of the concave groove, using this concave groove as a guideline. This makes it possible to easily arrange the waterproof film at an appropriate position.

Since the skin material and the cushioning material constituting the vehicle seat are joined by the adhesive applied to the area inside the ridge line of the seat except for the front end side of the seat, the most load is applied. Since the skin material is not fixed at the ridge line portion, an unreasonable force is not applied to the skin material, the occurrence of breaks and wrinkles is prevented, and a vehicle seat excellent in appearance can be obtained.

Further, since the skin material is free from being adhered from the vicinity of the ridge line of the cushion material to the terminal portion, the covering material can be easily covered with the cushion material, and assembling work such as tucker processing can be easily performed. Workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vehicle seat of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a perspective view showing a cushion material.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view of a main part of the vehicle seat.

FIG. 6 is an enlarged sectional view of a groove.

FIG. 7 is an explanatory view showing a vehicle seat using a vacuum-formed skin material.

8 is a sectional view taken along the line CC in FIG. 7;

FIG. 9 is a perspective view showing another example of a motorcycle seat shape.

FIG. 10 is an explanatory diagram showing a conventional example.

FIG. 11 is an explanatory diagram showing a conventional example.

FIG. 12 is an explanatory diagram showing a conventional example.

FIG. 13 is an explanatory diagram showing a conventional example.

FIG. 14 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Skin material 20 Cushion material 21 Waterproof film 22 Concave groove 23 Ridge line 30 Bottom plate 40 Adhesive 50 Adhesive surface S Motorcycle sheet

Claims (11)

[Claims] 1. A vehicle seat comprising a cushion material covered with a skin material, wherein the skin material is formed by joining a skin material including a seat surface region and a skin material not including a seat surface region, A concave groove is formed at a predetermined position including the joining line on the ridge line side of the cushion material, on the seat surface region side from the joining line, and does not include the seat surface region between the skin material and the cushion material. A vehicle seat, wherein a waterproof film is provided from a skin material side to a position of the concave groove. 2. The vehicle seat according to claim 1, wherein the skin material is formed by sequentially laminating a synthetic resin sheet, a base cloth, and a synthetic resin foam. 3. The skin material according to claim 1, wherein the surface treatment material is made of P
2. The vehicle seat according to claim 1, wherein VC, a base fabric made of knitted nylon yarn, and a synthetic resin foam are sequentially laminated. 4. The vehicle seat according to claim 2, wherein the synthetic resin foam is a closed-cell foam. 5. The vehicle seat according to claim 2, wherein the synthetic resin foam is a PVC foam. 6. The vehicle seat according to claim 3, wherein the surface treatment material is made of a vinyl chloride acrylate copolymer resin or a vinyl chloride methacrylate copolymer resin. 7. The vehicle seat according to claim 1, wherein the skin material and the cushion material are joined by an adhesive. 8. The vehicle seat according to claim 7, wherein the adhesive is applied to at least one of the skin material and the cushion material. 9. The vehicle seat according to claim 7, wherein the adhesive is applied to a region inside a ridgeline of the seat surface region except for a front end portion of the seat. 10. A method of manufacturing a vehicle seat comprising a cushion material covered with a skin material, wherein the cushion material has a surface facing the skin material at a predetermined position including a joining line on a ridgeline side of the cushion material. Forming a concave groove on the seat surface region side from the joining line; attaching a waterproof film to the cushion material; cutting the waterproof film along the concave groove; the cushion material and the skin A step of applying an adhesive to a contact surface with the material, a step of pressing the skin material and the cushion material, and a step of covering the cushion material with the skin material. Manufacturing method for a vehicle seat. 11. A method for manufacturing a vehicle seat in which a cushion material is covered with a skin material, wherein the cushion material has a side facing the skin material and a predetermined position including a joining line on a ridgeline side of the cushion material. Forming a groove on the side of the seating surface from the joint line; attaching a waterproof film to the cushion material; cutting the waterproof film along the groove; and vacuum forming the skin material A step of applying an adhesive to a contact surface between the cushion material and the skin material, a step of integrally molding the skin material and the cushion material, and forming the cushion material with the skin material. A method of manufacturing a vehicle seat, comprising: