Headrest device

Abstract

To obtain a headrest device which can thin thickness of a head of a stay holding member.SOLUTION: A headrest device 10 includes: a headrest stay 16; a stay holding member 20; and a lock mechanism 30. The lock mechanism 30 has an operation member 50, an elastic member 60, and a restriction member 70. The restriction member 70 is mounted in a body section 54 of the operation member 50 by making a longitudinal direction orthogonal to an axial direction of the headrest stay 16 viewed from an operation direction of a button section of the operation member 50. The operation member 50 has inclination in the same direction as the direction of inclination in a seat longitudinal direction of a lower surface 241 of a head 24 of the stay holding member 20 with respect to the restriction member 70 when the operation member 50 is viewed from the operation direction of the button section of the operation member 50.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a headrest device that supports the head of an occupant.

Background Art

[0002] Conventionally, as a means for fixing a headrest to a seat back, a structure is known in which a headrest bush (hereinafter referred to as an HR bush) is attached to the seat back, and a headrest stay on which a headrest is mounted is inserted into a hole penetrating in the axial direction provided in the HR bush. For example, Patent Document 1 discloses a structure of an HR bush in which the head is provided to be inclined with respect to the shaft portion in consideration of the inclination of the upper end of the seat back.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the structure of a conventional HR bush, as shown in FIG. 8 as an example, a lock mechanism 530 is provided to prevent the headrest stay 516 from detaching from the HR bush 520. The lock mechanism 530 includes, as an example, a long pin 570 that engages with a notch (not shown) provided in the headrest stay 516 to limit the vertical movement of the headrest, and an operation member 550 that moves the pin 570 in a direction to disengage and engage it from the notch. The pin 570 is arranged such that the longitudinal direction as viewed from the moving direction of the operation member 550, that is, the vehicle width direction, is orthogonal to the axial direction of the headrest stay 516 in order to facilitate engagement with the notch.

[0005] On the other hand, for components molded from resin in a headrest device, a minimum wall thickness D is set in the resin molding process from the viewpoint of strength and moldability. Therefore, in the HR bush 520 with an inclined head as described in Patent Document 1, when the inclination of the pin 570 and the operating member 550 are arranged in parallel, the internal space 5243 of the stopper portion 524 where the pin 570 and the operating member 550 are arranged is also arranged in parallel with the pin 70 and the operating member 550. Consequently, in relation to the minimum wall thicknesses D and D2, it is difficult to reduce the thickness of the stopper portion 524.

[0006] The present invention aims to provide a headrest device that can reduce the thickness of the head of the stay-holding member, taking the above facts into consideration. [Means for solving the problem]

[0007] A headrest device according to a first aspect of the present invention comprises a cylindrical headrest stay that supports a headrest and has one or more notches on its outer circumferential surface; a shaft portion fixed to the upper frame of a seat back frame; a retaining head portion on the upper side of the shaft portion in the vertical direction of the seat having a larger diameter than the shaft portion, having a rectangular space inside, having an opening on its outer circumferential surface that communicates with the space, and having a lower surface on the lower side of the lower side of the seat inclined in the front-rear direction of the seat with respect to a plane perpendicular to the axial direction of the shaft portion; a stay holding member having a cylindrical hole formed inside into which the headrest stay is inserted and held; and a locking mechanism that prevents the headrest stay from detaching from the stay holding member, wherein the locking mechanism is disposed in the space of the head portion at one end. The operating member has a plate-shaped main body portion and an operating button portion protruding from the opening at the other end, the headrest stay is inserted into the main body portion, and an insertion hole is provided with the operating direction of the button portion as the long axis; an elastic member is disposed in the space of the head and interposed between the inner surface of the head and one end of the operating member; and a long restricting member is attached to the main body portion with its longitudinal direction perpendicular to the axial direction of the headrest stay when viewed from the operating direction of the button portion, moves together with the operating member and restricts the vertical movement of the headrest by engaging with the notch, and when viewed from the operating direction of the button portion, the operating member is inclined with respect to the restricting member in the same direction as the inclination of the lower surface of the head in the front-rear direction of the seat.

[0008] In the headrest device according to the first aspect of the present invention, the limiting member is arranged such that its longitudinal direction, viewed from the operating direction of the button portion of the operating member, is perpendicular to the axial direction of the headrest stay, in order to facilitate engagement with the notch of the headrest stay. On the other hand, for members molded from resin in the headrest device, a minimum wall thickness is set in the resin molding process from the viewpoint of strength and moldability. Therefore, if the lower surface of the head of the stay holding member is inclined in the front-rear direction of the seat with respect to a plane perpendicular to the axial direction of the shaft portion, it is difficult to reduce the thickness of the head of the stay holding member in relation to the above minimum wall thickness if the operating member is arranged parallel to the inclination of the limiting member inside the stay holding member.

[0009] In the headrest device of the first embodiment of the present invention, when viewed from the operating direction of the button portion, the operating member is inclined in the same direction as the inclination of the underside of the head in the seat front-rear direction relative to the limiting member. Therefore, the inclination of the operating member can be brought closer to the inclination of the underside of the head in the seat front-rear direction. As a result, the thickness of the head on the side located below the seat can be reduced compared to the case where the inclination of the operating member is parallel to the inclination of the limiting member, and thus the thickness of the head of the stay holding member can be reduced.

[0010] In the headrest device of the second aspect of the present invention, in the configuration of the first aspect, the operating member is arranged parallel to the lower surface of the head when viewed from the operating direction of the button portion.

[0011] In the headrest device of the second aspect of the present invention, the operating member is arranged parallel to the lower surface of the head when viewed from the operating direction of the button portion. Compared to the case where the inclination of the operating member is parallel to the inclination of the limiting member, the overall thickness of the head can be made thinner in the front-rear direction of the seat, and thus the thickness of the head of the stay holding member can be made even thinner.

[0012] In the configuration of the first embodiment, the headrest device of the third embodiment has an inclination relative to the lower surface of the head when viewed from the direction of operation of the button portion.

[0013] In the headrest device of the third aspect of the present invention, the operating member is inclined with respect to the lower surface of the head when viewed from the direction of operation of the button portion. Compared to the case where the inclination of the operating member is parallel to the inclination of the limiting member, the thickness of the head on the side located below the seat can be reduced. Thus, the thickness of the head of the stay holding member can be reduced while ensuring the strength of the head. [Effects of the Invention]

[0014] As described above, the headrest device of the present invention has the excellent effect of making it possible to reduce the thickness of the head of the stay holding member compared to the case where the inclination of the operating member is parallel to the inclination of the limiting member. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing the headrest device of this embodiment. [Figure 2] This is a magnified perspective view of the main part of the headrest stay. [Figure 3] This is an enlarged perspective view of the stopper portion of the HR bush. [Figure 4] This is a perspective view of the operating component. [Figure 5] Figure 3 shows a cross-sectional view of line AA as seen from the button area. [Figure 6] This is a schematic side view showing the positional relationship between the pin and the operating member. [Figure 7] This is a cross-sectional view showing a modified configuration corresponding to Figure 5 of this embodiment. [Figure 8] This is a cross-sectional view showing the configuration of a conventional headrest device. [Modes for carrying out the invention]

[0016] A headrest device according to one embodiment of the present invention will be described with reference to Figures 1 to 6. Arrows FR, as shown in the drawings, indicate the front of the vehicle; arrows RH indicate the right side of the vehicle (one side in the vehicle width direction); and arrows UP indicate the top of the vehicle. Figure 1 is a perspective view showing the headrest device of this embodiment.

[0017] As shown in FIG. 1, a vehicle seat 11 to which a headrest device 10 according to an embodiment of the present invention is applied includes a seat cushion (not shown) on which an occupant sits, and a seat back 12 that stands upright from the rear end portion of the seat cushion and supports the upper body of the occupant sitting on the seat cushion. A headrest 14 for supporting the head of the occupant is provided at the upper end of the seat back 12. In FIG. 1, a seat back frame 18 is shown as the seat back 12, and illustration of a seat back pad and the like is omitted.

[0018] The headrest 14 includes a headrest main body 14A that supports the head of the occupant, and a headrest stay 16 that enables the headrest main body 14A to move vertically with respect to the seat back 12.

[0019] The headrest main body 14A has a barrel shape that extends in the vehicle width direction as the longitudinal direction and is flattened in the vehicle front-rear direction. Specifically, the headrest main body 14A is configured by covering a cushion material formed of foamed urethane with a skin material formed of a cloth material, leather, or the like.

[0020] The headrest stay 16 is formed, for example, by bending a steel cylindrical pipe material. Specifically, as shown in FIG. 1, the headrest stay 16 is formed in a substantially inverted U shape when viewed from the front of the vehicle, and is bent so that the upper end side is positioned forward of the vehicle when viewed from the left side in the vehicle width direction. Further, the upper end side of the headrest stay 16 is fixed to the headrest main body 14A, and a pair of support columns extend downward from the headrest main body 14A. The pair of support column portions of the headrest stay 16 are inserted into a cylindrical hole 22 (see FIG. 3) provided in the axial direction of an HR bush 20 as a stay holding member described later.

[0021] On the other hand, the HR bush 20 is fixed to the upper end of the seat back 12. In this embodiment, the headrest 14 is supported via the HR bush 20 so as to be movable in the vertical direction of the vehicle relative to the seat back 12. In the following description, the headrest stay 16 refers to the support column portion.

[0022] The headrest stay 16 is prevented from detaching from the HR bush 20 by a locking mechanism 30 (see Figure 3) provided on the stopper portion 24 of the HR bush 20, which will be described later. Figure 2 is an enlarged perspective view of the main part of the headrest stay 16. As shown in Figure 2, notches 16A are provided on the outer circumferential surface of the headrest stay 16. In this embodiment, as an example, the notches 16A are arranged to extend along a direction perpendicular to the axial direction on the right outer circumferential surface of the left headrest stay 16 in the vehicle width direction. Also in this embodiment, as an example, multiple notches 16A are provided along the axial direction, specifically, for example, five. The locking mechanism 30 restricts the relative movement of the headrest stay 16 in the vehicle vertical direction by engaging a pin 70, which will be described later, with the notches 16A. The locking mechanism 30 will be described in detail later.

[0023] Furthermore, the seat back 12 to which the headrest 14 is attached has a seat back frame 18 that is hollow and roughly rectangular in shape when viewed from the front, to which a seat back pad made of foamed urethane is fixed. The surface of the seat back pad is covered with a seat upholstery 40 made of fabric, leather, or the like.

[0024] The seat back frame 18 is connected to a seat cushion frame (not shown) provided within the seat cushion. The seat back frame 18 includes a pair of side frames 18A bent into a substantially U-shape in cross-section, and an upper frame 18B is provided above the side frames 18A. The upper frame 18B is formed in a U-shape with the rear of the vehicle open, and both ends of the upper frame 18B are fixed to the pair of side frames 18A, respectively.

[0025] In this embodiment, as an example, a pair of left and right HR bushings 20 are fixed to the upper frame 18B, and the left and right headrest stays 16 are inserted through the cylindrical holes 22 of the pair of left and right HR bushings 20 fixed to the upper frame 18B.

[0026] Figure 3 is an enlarged perspective view of the stopper portion 24 of the HR bush 20. The HR bush 20 is made of resin and, as shown in Figures 1 and 3, comprises a substantially cylindrical shaft portion 26 and a stopper portion 24 which is a head portion for preventing it from coming loose, and is provided with a cylindrical hole 22 into which the headrest stay 16 is inserted from the upper end to the lower end.

[0027] The stopper portion 24 is provided above the HR bush 20, i.e., above the shaft portion 26, and is inclined forward of the vehicle with respect to a plane P perpendicular to the axial direction of the shaft portion 26 (see Figure 5). Specifically in this embodiment, the lower surface 241 of the stopper portion 24 is arranged to be inclined in the seat front-rear direction with respect to a plane P perpendicular to the axial direction of the shaft portion 26.

[0028] The stopper portion 24 has a larger diameter than the shaft portion 26 and is formed in a substantially circular plate shape with a larger diameter than the mounting hole 42 of the seat surface 40 and the insertion hole (not shown) provided in the upper frame 18B. The stopper portion 24 also has a mounting portion 242 at its upper end, which is cut out in a substantially rectangular shape from the left end in the vehicle width direction toward the inward direction (rightward direction) and into which the button portion 52 of the operating member 50, which will be described later, is attached. The stopper portion 24 has a substantially rectangular space 243 in which the locking mechanism 30 is arranged. The stopper portion 24 further has an opening 244 on its outer peripheral surface 24A, specifically on the right side surface 242A of the mounting portion 242, which communicates with the space 243.

[0029] Next, the locking mechanism 30 will be described. In this embodiment, the locking mechanism 30 restricts the relative movement of the headrest stay 16 in the vehicle's vertical direction. The locking mechanism 30 is provided on at least one of the pair of left and right HR bushings 20, specifically on the stopper portion 24 of the left HR bushing 20 in the vehicle width direction. Figure 4 is a perspective view of the main part of the locking mechanism 30.

[0030] As shown in Figures 3 and 4, the locking mechanism 30 comprises an operating member 50, an elastic member 60, and a pin 70, and is mounted in the stopper portion 24 so as to be able to move back and forth from left to right in the left-right direction of the seat.

[0031] The operating member 50 has a plate-shaped main body 54 at one end (left side in the vehicle width direction) that is positioned in the space 243 of the stopper portion 24, and an operating button portion 52 at the other end (right side in the vehicle width direction) that protrudes from the opening 244 of the stopper portion 24 and is the part that the occupant presses to operate. The main body 54 extends to the right from the button portion 52 and has an insertion hole 54A that penetrates vertically through the interior and through which the headrest stay 16 is inserted. As an example, the insertion hole 54A is an elongated hole with the operating direction of the button portion 52 as its long axis.

[0032] Furthermore, the main body portion 54 has a pin hole 54B at its right end that penetrates in the front-to-back direction and through which a pin 70 is inserted. The main body portion 54 has claw portions 54C on its front and rear end faces, which serve as engaging portions that engage with the stopper portion 24.

[0033] As shown in Figure 3, the elastic member 60 is made of a spring and is attached to the outer circumference of a cylinder (not shown) protruding from the right end face of the main body 54. The elastic member 60 is positioned in the space 243 of the stopper portion 24 and is interposed between the inner surface of the stopper portion 24 and one end (left side in the vehicle width direction) of the operating member 50.

[0034] As shown in Figure 3, the pin 70 is formed as a long rectangular parallelepiped, and grooves (not shown) are formed on both end faces in the left-right direction as engaging portions that engage with the main body 54. The pin 70 is inserted through the pin hole 54B of the main body 54, and is fixed to the main body 54 by the engagement of the grooves with the main body 54. Furthermore, the pin 70 can be locked into or disengaged from the notch 16A formed in the headrest stay 16 by the movement of the main body 54 in the operating direction, i.e., the left-right direction of the seat, by operating the button portion 52.

[0035] The headrest stay 16 is inserted into the stopper portion 24 and passes through the insertion hole 54A of the main body portion 54. Since the insertion hole 54A is an elongated hole, there is a gap between the headrest stay 16 and the main body portion 54 in the portion where the headrest stay 16 passes through the main body portion 54, allowing the operating member 50 to move (advance and retreat). The operating member 50 is pressed against the headrest stay 16 by the biasing force of the elastic member 60. When the operating member 50 is pressed against the headrest stay 16, the pin 70 is biased toward the notch 16A, and the headrest stay 16 is locked by the pin 70.

[0036] The main body 54, elastic member 60, and pin 70 of the operating member 50 are housed in the space 243 of the stopper portion 24, with only the button portion 52 of the operating member 50 protruding. By pressing this button portion 52, the lock can be released. Specifically, when the button portion 52 is pressed, the main body 54 moves to the right, pressing the elastic member 60 in the opposite direction to the biasing direction of the elastic member 60, i.e., to the right, causing the pin 70 to disengage from the notch 16A, thereby releasing the lock on the headrest stay 16.

[0037] Although not shown in the diagram, the headrest stay 16 is provided with multiple notches 16A at predetermined intervals in the vertical direction, making it possible to lock the headrest stay 16 at a desired height. In this embodiment, the notches 16A are composed of grooves and extend in a direction perpendicular to the axial direction.

[0038] Figure 5 is a cross-sectional view of the cross-section along line AA in Figure 3, as seen from the button portion. Note that in Figure 5, the shapes of the button portion 52 and the space 243 are simplified for clarity. As shown in Figure 5, the pin 70 in this embodiment is mounted on the main body portion 54 with its longitudinal direction perpendicular to the axial direction of the headrest stay 16 when viewed from the operating direction of the button portion 52, and moves together with the main body portion 54, i.e., the operating member 50, as the button portion 52 is operated.

[0039] Furthermore, the main body portion 54, or operating member 50, is inclined in the same direction as the inclination of the lower surface 241 of the stopper portion 24 in the front-rear direction relative to the pin 70. Specifically, as an example, the operating member 50 is inclined 2° relative to the pin 70. In other words, the pin 70 is inclined relative to the main body portion 54. That is, as shown in Figure 4, in this embodiment, the pin hole 54B is provided at an angle in the front-rear direction of the sheet, and by inserting the pin 70 into this inclined pin hole 54B, the pin 70 and the main body portion 54 can be inclined. In other words, the pin 70 is inclined within the range of the thickness of the main body portion 54 in the vertical direction of the sheet.

[0040] Furthermore, the main body 54, or operating member 50, is inclined with respect to the lower surface 241 of the stopper portion 24. Specifically, as an example, the operating member 50 is inclined at 3° with respect to the lower surface 241 of the stopper portion 24.

[0041] The headrest device 10 of this embodiment is configured as described above. In this embodiment, the headrest stay 16, the HR bush 20, and the locking mechanism 30 are the main components of the headrest device 10.

[0042] Next, the operation and effects of this embodiment will be described.

[0043] In the headrest device 10 of this embodiment, the pin 70 is positioned such that its longitudinal direction, when viewed from the operating direction of the button portion 52 of the operating member 50, is perpendicular to the axial direction of the headrest stay 16, in order to facilitate engagement with the notch 16A of the headrest stay 16. On the other hand, for the resin-molded components in the headrest device 10, such as the operating member 50 and the HR bush 20, a minimum wall thickness is set in the resin molding process from the viewpoint of strength and moldability.

[0044] Specifically, as shown in Figure 5, a minimum thickness D is set as an example for the thickness from the upper end of the stopper portion 24 to the space 243. Figure 6 is a schematic side view showing the positional relationship between the pin 70 and the operating member 50. Also, as shown by the dashed line in Figure 6, the main body portion 54 is provided with a pin hole 54B through which the pin 70 is inserted. Therefore, a minimum thickness D2 is set between the pin 70 and the main body portion 54 (operating member 50) in terms of resin molding.

[0045] On the other hand, the angle of inclination of the lower surface 241 of the stopper portion 24 with respect to the shaft portion 26 is predetermined by the shape of the seat back 12 of the vehicle seat 11 to which the headrest device 10 is applied. Figure 8 is a cross-sectional view showing the configuration of a conventional headrest device. As shown in Figure 8, if the lower surface 5241 of the stopper portion 524 of the HR bush 520 is inclined in the front-rear direction of the seat with respect to a plane P perpendicular to the axial direction of the shaft portion 526, then, in the internal space 5243 of the HR bush 520, if the operating member 550 is placed parallel to the inclination of the pin 570, it is difficult to reduce the thickness of the stopper portion 524 of the HR bush 520 in relation to the minimum wall thicknesses D and D2.

[0046] In the headrest device 10 of this embodiment, as shown in Figure 5, when viewed from the operating direction of the button portion 52, the main body portion 54 (operating member 50) is tilted in the same direction as the inclination of the lower surface 241 of the stopper portion 24 in the seat front-rear direction relative to the pin 70. Specifically, the operating member 50 is tilted 2° counterclockwise relative to the pin 70 in Figure 5. Here, the inclination angle is set to an angle that can maintain the minimum thickness D2, as shown in Figure 6. By having the operating member 50 tilted in this way, the inclination of the operating member 50 can be brought closer to the inclination of the lower surface 241 of the stopper portion 24 in the seat front-rear direction.

[0047] Furthermore, in this embodiment, the space 243 of the stopper portion 24 is tilted in accordance with the tilt of the operating member 50. Here, in the HR bush 20 in Figure 5, the dotted line shows the shape of the HR bush 20 before the operating member 50 is tilted. As shown in Figure 5, by tilting the space 243 at the same angle as the operating member 50, the upper surface in front of the seat of the space 243 is lowered. Therefore, the thickness of the stopper portion 24 can be reduced while maintaining the minimum wall thickness D from the upper end of the stopper portion 24 to the space 243. Thus, in this embodiment, the thickness of the stopper portion 24 can be reduced compared to the case where the tilt of the operating member 50 is parallel to the tilt of the pin 70.

[0048] Furthermore, in the headrest device 10 of this embodiment, the operating member 50 is inclined with respect to the lower surface 241 of the stopper portion 24 when viewed from the operating direction of the button portion 52. Specifically, the operating member 50 is inclined 3° counterclockwise with respect to the lower surface 241 of the stopper portion 24 as shown in Figure 5. By inclining the operating member 50 with respect to the lower surface 241 of the stopper portion 24 in this way, it is possible to maintain the minimum wall thickness D2 between the pin 70 and the main body portion 54 (operating member 50), thereby reducing the thickness of the stopper portion 24 while ensuring the strength of the stopper portion 24.

[0049] In the above embodiment, the headrest device 10 has an inclination of the operating member 50 with respect to the lower surface 241 of the stopper portion 24 when viewed from the operating direction of the button portion 52, but the present invention is not limited to this. Now, a modified example of the headrest device 10 of the above embodiment will be described. Figure 7 is a cross-sectional view showing the configuration of a modified example corresponding to Figure 5 of this embodiment. In Figure 7, components that are the same as those of the headrest device 10 of the above embodiment are indicated by the same reference numerals and their descriptions are omitted, and only the different parts will be described.

[0050] As shown in Figure 7, in the modified example, the operating member 50 is positioned parallel to the lower surface 241 of the stopper portion 24 when viewed from the operating direction of the button portion 52. Even when the operating member 50 is positioned parallel to the lower surface 241 of the stopper portion 24, if the main body portion 54 has a shape that can secure the minimum wall thickness D2 between the pin 70 and the main body portion 54 (operating member 50), for example, if the thickness of the main body portion 54 is thicker than in the above embodiment, it is preferable to position the operating member 50 parallel to the lower surface 241 of the stopper portion 24.

[0051] In this way, by arranging the operating member 50 parallel to the lower surface 241 of the stopper portion 24, and making the space 243 parallel to the lower surface 241 of the stopper portion 24 in the same way as the operating member 50, the upper surface of the space 243 in front of the sheet is lowered. Therefore, the thickness of the stopper portion 24 can be reduced while maintaining the minimum thickness D from the upper end of the stopper portion 24 to the space 243. At this time, the thickness of the rear side of the stopper portion 24 can also be made the same as the front side, so the overall thickness of the stopper portion 24 can be reduced in the front-rear direction of the sheet.

[0052] (Other aspects) In the above embodiment, the headrest stay 16 on the left side in the vehicle width direction of the vehicle seat 11, the HR bush 20 into which the left headrest stay 16 is inserted, and the locking mechanism 30 provided on the left HR bush 20 have been described. However, this configuration may also be applied to the right side in the vehicle width direction, or to both the left and right sides.

[0053] Furthermore, although the headrest stay 16 is provided with multiple notches 16A in the above embodiment, the present invention is not limited thereto, and there may be only one notch 16A.

[0054] Furthermore, in this invention, the pin 70 is arranged perpendicular to the axial direction of the headrest stay 16. However, if, for example, the notch 16A formed in the headrest stay 16 has an inclination, the pin 70 is also inclined to match this inclination. That is, the direction of extension of the notch 16A and the pin 70 are aligned.

[0055] Although one embodiment of the present invention and its modifications have been described above, the present invention is not limited to the above, and it is of course possible to implement it in various other forms without departing from the spirit of the invention. [Explanation of symbols]

[0056] 10 Headrest device 16 Headrest Stays 16A Notch 18 Seat back frame 18B Upper Frame 20 HR bushing (headrest bushing; stay retaining member) 22 Cylindrical hole 24 Stopper part (head) 241 Bottom surface 243 Space 244 Aperture 26 Shaft section 30 Locking mechanism 50 Operating member 52 Button section 54 Main body 60 Elastic members 70 pins (restricting members) D Minimum wall thickness D2 Minimum wall thickness P plane

Claims

1. A cylindrical headrest stay that supports the headrest and has one or more notches on its outer surface, A stay holding member comprising: a shaft portion fixed to the upper frame of the seat back frame; a retaining head portion having a larger diameter than the shaft portion on the upper side of the shaft portion in the vertical direction of the seat, having a rectangular space inside, having an opening on its outer surface that communicates with the space, and having a lower surface on the lower side of the lower side of the seat inclined in the front-rear direction of the seat with respect to a plane perpendicular to the axial direction of the shaft portion; and having a cylindrical hole formed inside into which the headrest stay is inserted and held; The system includes a locking mechanism to prevent the headrest stay from detaching from the stay retaining member, The locking mechanism, An operating member having a plate-shaped main body portion at one end that is positioned in the space of the head, and an operating button portion at the other end that protrudes from the opening, the headrest stay is inserted into the main body portion, and an insertion hole is provided with the operating direction of the button portion as the long axis, An elastic member is disposed in the space of the head and interposed between the inner surface of the head and one end of the operating member, The headrest comprises a long limiting member mounted on the main body with its longitudinal direction perpendicular to the axial direction of the headrest stay when viewed from the operating direction of the button portion, which moves together with the operating member and restricts the vertical movement of the headrest by engaging with the notch, A headrest device in which, when viewed from the operating direction of the button portion, the operating member is tilted in the same direction as the tilt of the lower surface of the head in the front-to-back direction of the seat with respect to the limiting member.

2. The headrest device according to claim 1, wherein, with reference to the operating direction of the button portion, the operating member is arranged parallel to the lower surface of the head.

3. The headrest device according to claim 1, wherein, viewed from the direction of operation of the button portion, the operating member is inclined with respect to the lower surface of the head.

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