Pillow

Abstract

To provide a pillow capable of reducing an uncomfortable feeling when a user turns over in bed.SOLUTION: A pillow 10 comprises a first layer 1 having cushioning properties, and a second layer 2 which overlaps the first layer 1 and which is filled with a filler. The second layer 2 is formed so that first, second and third parts 3, 4 and 5 formed to extend in a lateral direction can be arranged in this order in a longitudinal direction, in a plan view. In the second layer 2, the second part 4 is lower in filler density than the first part 3 and the third part 5.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pillow.

Background Art

[0002] Patent Document 1 describes one aspect of a pillow. The pillow (cushioning material in Patent Document 1) described in Patent Document 1 houses a plurality of thickness materials inside a pillow cover.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, since the cushioning material described in Patent Document 1 houses a plurality of thickness materials inside the pillow cover, it has high cushioning properties. However, although the cushioning material of Patent Document 1 has high cushioning properties, when turning over, the user's ear is pressed, and when the user's shoulder rests on the edge of the cushioning material, the part where the head rests also sinks, so there is a problem that there is a sense of discomfort in the comfort when turning over. The present invention has been made in view of the above circumstances, and an object thereof is to provide a pillow that can alleviate the sense of discomfort in comfort when turning over and has good comfort.

Means for Solving the Problems

[0005] A pillow according to one aspect of the present invention includes a first layer having cushioning properties and a second layer that overlaps the first layer and is filled with a filling material. In the second layer, in a plan view, a first portion, a second portion, and a third portion formed to extend in the lateral direction are arranged in this order in the longitudinal direction. In the second layer, the density of the filling material is such that the second portion is smaller than the first portion and the third portion.

Effects of the Invention

[0006] The pillow of the above aspect according to the present invention has an advantage that it can alleviate the discomfort in the sleeping comfort when turning over and can provide a pillow with good sleeping comfort.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0008] <Embodiment> As shown in FIG. 1, the pillow 10 according to the present embodiment has a first layer 1 having cushioning properties and a second layer 2 laminated thereon. As shown in FIG. 3, the second layer 2 is filled with a filling material S2. As shown in FIG. 2, when viewed from above along the thickness direction of the pillow 10 (hereinafter referred to as “plan view” or “top view”), the first portion 3, the second portion 4, and the third portion 5 extend in the lateral direction and are formed so as to be arranged in the longitudinal direction. And in the second layer 2, the density of the filling material S2 is such that the second portion 4 is smaller than the first portion 3 and the third portion 5.

[0009] As a result, since the user's ear is located in the second portion 4, even when the user turns over, the pressure on the user's ear can be reduced. Moreover, since the first portion 3 and the third portion 5 are separated by the second portion 4, even if the user's shoulder rests on the third portion 5, for example, the first portion 3 is unlikely to become lower. That is, even when turning over, the influence of the position of the shoulder on the height of the pillow 10 can be reduced. As a result, according to the pillow 10 of the present embodiment, the discomfort in the sleeping comfort when turning over can be alleviated, and a pillow 10 with good sleeping comfort can be obtained.

[0010] As used in this specification, "parallel" does not only mean that two straight lines, planes, sides, etc. (hereinafter referred to as straight lines, etc.) do not intersect even when extended, but also includes the case where they intersect within 10° when the straight lines, etc. are extended. "Orthogonal" includes the case where two straight lines, etc. intersect within the range of 90° ± 10°, and also includes the case where two straight lines, etc. are actually separated but intersect when extended.

[0011] For the sake of convenience in description, in the thickness direction, the direction from the first layer 1 to the second layer 2 is defined as the "upward direction", and the opposite direction is defined as the "downward direction". Also, as shown in FIG. 2, in a plane orthogonal to the thickness direction, two mutually orthogonal directions are defined as the "longitudinal direction" and the "lateral direction". However, these definitions of directions are only specified for the convenience of description and do not specify the usage mode. (The first layer 1)

[0012] The first layer 1 is a cushion layer that overlaps the second layer 2. As shown in FIG. 3, the first layer 1 includes a bag-shaped cover (hereinafter referred to as the first bag body 11) and a filling material (hereinafter referred to as the first filling material S1) filled in the first bag body 11. The first layer 1 is entirely filled with the first filling material S1, and in the first layer 1, the surface on the side opposite to the second layer 2 is a flat surface except for the outer peripheral portion.

[0013] The first bag body 11 is formed in a bag shape and has an accommodation space for filling the first filling material S1 inside. The first bag body 11 is formed, for example, by overlapping two rectangular fabric materials and joining the outer peripheral portions. However, the first bag body 11 may also be formed by accommodating the first filling material S1 in a tubular fabric and then joining the opening ends. As used in this specification, "joining" includes, for example, sewing, heat sealing (welding), adhesion, etc. In this embodiment, the outer peripheral portion of the first bag body 11 is joined by sewing.

[0014] The first filling material S1 is filled into the first bag body 11. The first filling material S1 is not particularly limited, and examples thereof include pipe beads, natural fibers, polystyrene foam beads, feathers, adzuki beans, buckwheat husks, etc., or composite materials thereof. Microfiber cotton is used for the first filling material S1 according to the present embodiment. Thereby, good cushioning properties can be obtained. However, as long as the first filling material S1 has cushioning properties as a whole, it does not have to have cushioning properties when viewed in minute units. (Second layer 2)

[0015] The second layer 2 is a cushion layer that overlaps the first layer 1. As shown in FIG. 3, the second layer 2 includes a bag-shaped cover (hereinafter referred to as the second bag body 21) and a filling material (hereinafter referred to as the second filling material S2) filled in the second bag body 21. The second layer 2 is integrated with the first layer 1 by joining (sewing in this embodiment) at the outer peripheral portion.

[0016] The second bag body 21 is formed in a bag shape in the same manner as the first bag body 11 and has an accommodation space for filling the second filling material S2 therein. The second bag body 21 is formed, for example, by overlapping two rectangular cloth materials and joining the outer peripheral portions. However, the second bag body 21 may be formed by accommodating the second filling material S2 in a cylindrical fabric and then joining the opening end portions. In the present embodiment, the outer peripheral portion of the second bag body 21 is joined by sewing in the same manner as the first bag body 11.

[0017] The second filling material S2 is filled in the second bag body 21 at positions corresponding to the first portion 3 and the second portion 4. The second filling material S2 is not particularly limited, and examples thereof include pipe beads, natural fibers, polystyrene foam beads, feathers, adzuki beans, buckwheat husks, etc., or composite materials thereof. A plurality of pipe beads are used for the second filling material S2 according to the present embodiment. Thereby, good cushioning properties can be obtained while maintaining a certain degree of firmness.

[0018] As shown in FIG. 2, in a plan view, the second layer 2 is formed such that a first portion 3, a second portion 4, and a third portion 5 that are formed to extend in the lateral direction are arranged in this order in the longitudinal direction. The first portion 3 and the third portion 5 are edges at the longitudinal ends of the pillow 10 and have edges that extend in the lateral direction.

[0019] As shown in FIG. 3, the first portion 3 and the third portion 5 are formed in a bag shape and filled with a second filler S2 inside. It is preferable that the density of the second filler S2 is different between the first portion 3 and the second portion 4. That is, it is preferable that the density of the second filler S2 in the first portion 3 is greater than the density of the second filler S2 in the third portion 5. In this case, regarding the density of the second filler S2, the first portion 3 is preferably more than 1.0 times, more preferably 1.2 times or more, still more preferably 1.5 times or more, and still more preferably 1.6 times or more with respect to the second portion 4. On the other hand, regarding the density of the second filler S2, the first portion 3 is preferably 2.0 times or less, more preferably 1.8 times or less with respect to the second portion 4. Thereby, for example, when the user is petite or slender like a woman, etc., if the third portion 5 is placed close to the shoulder and the head is placed on the first portion 3, the pillow 10 can be made to fit the user better. Also, for example, when the user has broad shoulders like a man, etc., if the first portion 3 is placed close to the shoulder and the head is placed on the third portion 5, the pillow 10 can be made to fit the user better.

[0020] The first portion 3, the second portion 4, and the third portion 5 are preferably formed over the entire lateral length. Thereby, regardless of the size of the user's head, it is easy to enclose the ears in the second portion 4 even when turning over laterally. However, the second portion 4 does not necessarily have to be formed over the entire lateral length of the pillow 10.

[0021] In a plan view, the second portion 4 is formed along a center line C1 that passes through the longitudinal center of the pillow 10. The center line C1 extends parallel to the lateral direction. The second portion 4 overlaps the center line C1 over its entire length.

[0022] Similar to the first part 3 and the third part 5, a space is formed between the front fabric material and the back fabric material in the second part 4. However, in the second part 4, the density of the second filling material S2 is smaller than that in the first part 3 and the third part 5. In the second part 4 according to this embodiment, the second filling material S2 is not filled (that is, the density of the second filling material S2 in the second part 4 is zero). In the second part 4, the fabric material on the front surface side and the fabric material on the back surface side of the second bag body 21 overlap. As shown in FIG. 1, the surface of the second part 4 is recessed with respect to the surfaces of the first part 3 and the third part 5. Since the second part 4 is provided in the pillow 10 according to this embodiment, when the user's ear is located in the second part 4, even if the user turns over, the pressure on the user's ear can be reduced. Moreover, since the first part 3 and the third part 5 are separated by the second part 4, even if the user's shoulder rests on, for example, the third part 5, the first part 3 is unlikely to become lower. Note that the second part 4 may not have a fabric material (that is, it may be a through hole), and the first layer 1 may be exposed.

[0023] The boundary line 6 between the second part 4 and the first part 3 and the boundary line 6 between the third part 5 and the first part 3 are preferably wavy. Thereby, the user can adjust the comfort by changing the position in the lateral direction of the head. The boundary line 6 is a line formed by joining the front fabric material and the back fabric material of the second layer 2. The boundary line 6 according to this embodiment is formed by sewing.

[0024] In this embodiment, since the boundary line 6 between the second part 4 and the first part 3 and the boundary line 6 between the third part 5 and the first part 3 are wavy, a plurality of parts with different widths can be formed for the second part 4. The second part 4 can be divided into a central part 41 and a pair of side parts 42 as a plurality of parts with different widths.

[0025] The central part 41 is a region including the horizontal central part 41 and is a region targeted at the center line (target axis) extending in the vertical direction. The target axis of the central part 41 passes through the center in the horizontal direction. The central part 41 according to the present embodiment is a region sandwiched by a pair of arc-shaped boundary lines 6, has the largest width in the vertical direction at the center in the horizontal direction, and has the smallest width in the vertical direction at both ends in the horizontal direction (the portions indicated by reference numeral 43 in FIG. 2).

[0026] The horizontal length of the central part 41 is preferably a length that can accommodate the back of the head of the supine user. As the horizontal length L4 of the central part 41, it is preferably 8 cm or more and 12 cm or less, more preferably 9 cm or more and 11 cm or less, and still more preferably 9.5 cm or more and 10.5 cm or less. By configuring in this way, when the user lies on their back, the head is likely to be stable, so that a good sleeping comfort can be obtained.

[0027] The maximum width (L2×2) of the central part 41 in the vertical direction is preferably 5 cm or more and 7 cm or less, more preferably 5.5 cm or more and 6.5 cm or less, and still more preferably 5.8 cm or more and 6.2 cm or less. By configuring in this way, when the user lies on their back, the head is likely to be stable. Also, the minimum width (L3×2) of the central part 41 in the vertical direction is preferably 2 cm or more and 4 cm or less, more preferably 2.5 cm or more and 3.5 cm or less, and still more preferably 2.8 cm or more and 3.2 cm or less.

[0028] The pair of side parts 42 are regions located on both sides in the horizontal direction of the central part 41. Each side part 42 is connected to the horizontal ends of the central part 41. The side part 42 according to the present embodiment is formed such that the width gradually expands from the end of the central part 41 toward the outer end in the horizontal direction and then narrows again.

[0029] In the central portion 41, when the user lying on their back turns over laterally from a state where the back of the head is accommodated, it is preferable that the pair of side portions 42 accommodate the user's ears. The distance L5 between the center in the lateral direction of each side portion 42 and the center in the lateral direction is preferably located in the range of 19 cm or more and 22 cm or less, more preferably 19.5 cm or more and 21.5 cm or less, and still more preferably 19.8 cm or more and 20.5 cm or less. With such a configuration, when the user turns over, the user's ears are likely to be accommodated in the side portions 42.

[0030] The maximum width (L1×2) in the longitudinal direction of the side portion 42 is preferably larger than the maximum width (width L2×2) in the longitudinal direction of the central portion 41. The maximum width in the longitudinal direction of the side portion 42 is preferably 15 cm or more, more preferably 15.5 cm or more, and still more preferably 16 cm or more. On the other hand, the upper limit of the maximum width in the longitudinal direction of the side portion 42 is preferably 17 cm or less. With such a configuration, when the user turns over, the user's ears are likely to be accommodated in the side portions 42.

[0031] The boundary line 6 between the second portion 4 and the first portion 3 and the boundary line 6 between the second portion 4 and the third portion 5 are preferably line-symmetric about the center line C1 as the central axis. As a result, no matter which of the first portion 3 and the third portion 5 is brought closer to the user's shoulder, the back of the user's head is likely to be accommodated in the central portion 41, and when the user turns over, the user's ears are likely to be accommodated in the side portions 42. (Carbon material 8)

[0032] The carbon material 8 is arranged along at least one of the longitudinal edges of the pillow 10. In the present embodiment, each carbon material 8 is arranged in the central portion 41 in the lateral direction at the longitudinal edge of the pillow 10. By arranging each carbon material 8 at least in the central portion 41 in the lateral direction at the longitudinal edge of the pillow 10, the carbon material 8 can be arranged at the portion where the user is likely to sweat, and the odor at the user's neck can be absorbed. Thereby, when the user uses the pillow 10, the odor associated with the aging of the user and the odor due to sweating can be deodorized, and the increase of bacteria can be suppressed.

[0033] The carbon material 8 is preferably accommodated in a pocket 7 provided so as to overlap the longitudinal edges between the first layer 1 and the second layer 2. The pocket 7 is preferably pulled out from between the first layer 1 and the second layer 2, and after accommodating the carbon material 8, it can be accommodated between the first layer 1 and the second layer 2. Further, as shown in FIG. 2, in plan view, the pocket 7 is preferably arranged so that a part thereof protrudes from the first layer 1 or the second layer 2. Thereby, it is possible to appeal that it is the pillow 10 having the carbon material 8.

[0034] Further, since the carbon material 8 is arranged along at least one of the longitudinal edges of the pillow 10, when the user places the head on the pillow 10, the carbon material 8 can be displaced from below the head, so that the hardness of the carbon material 8 can reduce the discomfort felt by the user.

[0035] Examples of the carbon material 8 include activated carbon, charcoal, composite carbon materials, etc. The carbon material 8 according to the present embodiment is a composite carbon material. The composite carbon material is formed, for example, by blending an inorganic additive (such as ceramic powder) with wood chips of about 3 to 5 mm and firing. As an example of the composite carbon material, a known one can be preferably used.

[0036] The carbon material 8 is preferably a cartridge. Thereby, when the carbon material 8 deteriorates, it can be easily replaced with a new carbon material 8. Examples of the cartridge include a box shape, a sheet shape, a bag shape, a strip shape, a rod shape, etc. <Modification>

[0037] The above embodiment is only one of various embodiments of the present invention. The embodiment can be variously modified according to the design etc. as long as the object of the present invention can be achieved. Hereinafter, modification examples of the embodiment will be listed. The modification examples described below can be applied in appropriate combinations.

[0038] In the above-described embodiment, the boundary line 6 between the second portion 4 and the first portion 3 and the boundary line 6 between the second portion 4 and the third portion 5 were line-symmetric, but as shown in FIG. 4, they do not have to be symmetric. In the pillow 10 according to the modified example, in the side portion 42 of the second portion 4, the maximum distance L12 between the boundary line 6 between the second portion 4 and the third portion 5 and the center line C1 is longer than the maximum distance L11 between the boundary line 6 between the second portion 4 and the first portion 3 and the center line C1. As a result, for a user with a relatively small build, by arranging the third portion 5 on the side closer to the shoulder, it is easier to tuck the ear into the side portion 42 when turning over. Also, for a user with a relatively large build, by arranging the first portion 3 on the side closer to the shoulder, it is easier to tuck the ear into the side portion 42 when turning over. That is, according to the modified example, it is possible to reduce the pressure on the ear when turning over for users of various builds. At this time, at the boundary line 6 between the second portion 4 and the third portion 5, the portion where the maximum distance L12 from the center line C1 is taken is preferably located more centrally in the lateral direction than the portion where the maximum distance L11 from the center line C1 is taken at the boundary line 6 between the second portion 4 and the first portion 3.

[0039] In the above-described embodiment, the second portion 4 was sandwiched by the wavy boundary line 6, but the boundary line 6 may be straight. At this time, the longitudinal width of the second portion 4 is preferably formed to be, for example, 2 cm or more and 3 cm or less over the entire length. In the above-described embodiment, the densities of the second filler S2 in the first portion 3 and the second portion 4 were different densities, but the second filler S2 may be filled with the same density.

[0040] In the above-described embodiment, an example was described in which the first layer 1 is used as the lower layer and the second layer 2 is used as the upper layer, but the pillow 10 may be used with the first layer 1 as the upper layer and the second layer 2 as the lower layer. Even in this case, in the first layer 1, the portion corresponding to the concave second portion 4 is concave, so the sense of pressure on the ear when turning over can be reduced.

[0041] In the above-described embodiment, the usage method of arranging and using the pillow 10 was described based on the arrangement such that the longitudinal direction of the pillow 10 is parallel to the direction along the user's neck to the head. However, the pillow 10 may be arranged and used such that the transverse direction is parallel to the direction along the user's neck to the head. Further, the orientation of the longitudinal direction of the pillow 10 according to the above-described embodiment may be arranged and used in the opposite direction to that in FIG. 2.

[0042] In the above-described embodiment, the pillow 10 was rectangular in a horizontal long shape in a plan view, but it may be square in a plan view, or may be other polygonal shapes, circular shapes, elliptical shapes, or the like.

[0043] In the above-described embodiment, the density of the filling material of the second portion 4 was zero, but the second portion 4 may be filled with a filling material as long as the density is smaller than that of the first portion 3 and the third portion 5.

[0044] In the pocket 7 according to the above-described embodiment, the carbon material 8 is accommodated. However, as long as it is a functional member, not limited to the carbon material 8, a heating device or a cooling device may be accommodated. The functional member means a member having a function, and preferably has at least one function of heating, cooling, and deodorizing. Examples of the heating device include a member that emits far-infrared rays (for example, ceramics, etc.), a material having a high effect of warming the body, a disposable warmer, an azuki bean warmer, and the like. Examples of the cooling device include a cold insulation material, an ice pack, and the like. Thereby, in winter, by accommodating a heating device as a functional member in the pocket 7, the neck can be warmed. As a result, the blood circulation of the whole body is improved, the hands and feet are quickly warmed, heat radiation is promoted, the deep body temperature drops, and it can be expected that it becomes easier to fall asleep. Further, in summer, by accommodating a cooling device as a functional member in the pocket 7, the neck can be cooled. Since thick blood vessels pass under the neck, it can be expected that the body temperature easily drops and it becomes easier to fall asleep. Further, the pocket 7 may be configured to widen from the end of the central portion in the lateral direction toward the outer end in the lateral direction. Thereby, even when the user turns over and the user's ear is positioned at the second portion 4, the carbon material 8 accommodated in the pocket 7 can be disposed near the user's ear. Also, the pocket 7 may be configured to widen from the outer end in the longitudinal direction to the end of the side portion. <Summary>

[0045] As described above, the pillow 10 according to the first aspect includes the first layer 1 having cushioning properties and the second layer 2 overlapping the first layer 1 and filled with a filler. In the second layer 2, in plan view, the first portion 3, the second portion 4, and the third portion 5 formed to extend in the lateral direction are formed to be arranged in this order in the longitudinal direction. In the second layer 2, the density of the filler is such that the second portion 4 is smaller than the first portion 3 and the third portion 5.

[0046] According to this aspect, since the user's ear is positioned at the second portion 4, even when the user turns over, the pressure on the user's ear can be reduced. Moreover, since the first portion 3 and the third portion 5 are separated by the second portion 4, even if the user's shoulder rests on, for example, the third portion 5, the first portion 3 is less likely to become lower. That is, even when turning over, the influence of the position of the shoulder on the height of the pillow 10 can be reduced. As a result, according to the pillow 10 of the present embodiment, the uncomfortable feeling of comfort during turning over can be alleviated.

[0047] In the pillow 10 according to the second aspect, in the first aspect, the second portion 4 is not filled with a filler. According to this aspect, it is easier to stabilize the user's head and the pressure on the ear during turning over can be further reduced.

[0048] In the pillow 10 according to the third aspect, in the first or second aspect, the density of the filler is different between the first portion 3 and the third portion 5. According to this aspect, according to the size of the physique, the first portion 3 can be placed closer to the shoulder side or the third portion 5 can be arranged closer to the shoulder side, and the pillow 10 can be made to correspond to users with various physiques.

[0049] In the pillow 10 according to the fourth aspect, in any one of the first to third aspects, the boundary line 6 between the second part 4 and the first part 3 and the boundary line 6 between the second part 4 and the third part 5 are wavy. According to this aspect, with respect to the user's head, by changing the position in the lateral direction, the comfort can be adjusted.

[0050] In the pillow 10 according to the fifth aspect, in the third aspect, the second part 4 has a central portion 41 in the lateral direction and a pair of side portions 42 located on both lateral sides of the central portion 41. The vertical width of the side portion 42 is larger than the vertical width of the central portion 41. According to this aspect, when the user turns over, the user's ears are likely to fit into the side portions 42.

[0051] In the pillow 10 according to the sixth aspect, in the fifth aspect, the second part 4 is formed along a center line C1 passing through the longitudinal center of the pillow 10. In the side portion 42, the maximum distance between the boundary line 6 between the second part 4 and the third part 5 and the center line C1 is longer than the maximum distance between the boundary line 6 between the second part 4 and the first part 3 and the center line C1. According to this aspect, for users of various physiques, the pressure on the ears during turning over can be reduced.

[0052] In the pillow 10 according to the seventh aspect, in any one of the first to fourth aspects, the boundary line 6 between the second part 4 and the first part 3 and the boundary line 6 between the second part 4 and the third part 5 are line-symmetric. According to this aspect, no matter which of the first part 3 and the third part 5 is brought closer to the user's shoulder, the user's occipital region is likely to fit into the central portion 41, and when the user turns over, the user's ears are likely to fit into the side portions 42.

[0053] In the pillow 10 according to the eighth aspect, in any one of the first to seventh aspects, the second part 4 is formed over the entire lateral length. According to this aspect, regardless of the size of the head, even if the user turns over in the lateral direction, the pressure on the ears can be reduced.

[0054] In the pillow 10 according to the ninth aspect, in any one of the first to eighth aspects, it further includes a pocket 7 provided on at least one of the longitudinal edges. According to this aspect, by accommodating a functional member in the pocket 7, a function can be imparted to the pillow 10. For example, in winter, by accommodating a heating device as a functional member in the pocket 7, the neck can be warmed. As a result, the blood circulation of the whole body is improved, the hands and feet are quickly warmed, heat dissipation is promoted, the deep body temperature drops, and it can be expected that it will be easier to fall asleep. Also, in summer, by accommodating a cooling device as a functional member in the pocket 7, the neck can be cooled. Since thick blood vessels pass under the neck, it is expected that the body temperature will easily drop and it will be easier to fall asleep.

[0055] In the pillow 10 according to the tenth aspect, in the ninth aspect, a carbon material 8 is accommodated in the pocket 7. According to this aspect, the carbon material 8 can be arranged at the part where the user is likely to sweat, and the odor of the user's neck can be absorbed.

Explanation of Signs

[0056] 10 Pillow 1 First layer 11 First bag body S1 First filling material 2 Second layer 21 Second bag body 3 First part S2 Second filling material (filling material) 4 Second part 41 Central part 42 Side part 5 Third part 6 Boundary line 7 Pocket 8 Carbon material C1 Center line

Claims

1. a first layer having cushioning properties; a second layer overlapping the first layer and filled with a filling material; comprising; in a plan view, in the second layer, a first portion, a second portion, and a third portion formed to extend in the lateral direction are formed to be arranged in this order in the longitudinal direction; In the second layer, the density of the filling material is such that the second portion is smaller than the first portion and the third portion, a pillow.

2. The second portion is not filled with the filling material, The pillow according to claim 1.

3. The density of the filling material is different between the first portion and the third portion, The pillow according to claim 1 or claim 2.

4. The boundary line between the second portion and the first portion and the boundary line between the second portion and the third portion are wavy, The pillow according to claim 1 or claim 2.

5. The second portion has a central portion in the lateral direction and a pair of side portions located on both lateral sides of the central portion, The longitudinal width of the side portion is larger than the longitudinal width of the central portion, The pillow according to claim 3.

6. The second portion is formed along a center line passing through the longitudinal center of the pillow, In the side portion, the maximum distance between the boundary line between the second portion and the third portion and the center line is longer than the maximum distance between the boundary line between the second portion and the first portion and the center line, The pillow according to claim 5.

7. The boundary line between the second portion and the first portion and the boundary line between the second portion and the third portion are line-symmetric, The pillow according to claim 4.

8. The second portion is formed over the entire lateral length, The pillow according to claim 1 or claim 2.

9. further comprising pockets provided on at least one of both longitudinal edges; The pillow according to claim 1 or claim 2.

10. The pockets contain a carbon material, The pillow according to claim 9.

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