mattress

Abstract

This product provides a mattress with a simple structure that can help suppress facial problems that occur with aging. [Solution] The mattress 1 has a recess 24 in the portion where at least the back of the head BH of a person HU sleeping on their back makes contact, into which a part of the back of the head fits. The recess 24 is configured so that the tip of the chin CH CH1 of the person HU sleeping on their back is positioned above the forehead FH. The mattress 1 is integrally formed.

Description

Technical Field

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[0001] The present invention relates to a mattress.

Background Art

[0002] <s In recent years, various mattress shapes have been proposed. For example, Patent Document 1 proposes a mattress composed of a plurality of parts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the mattress disclosed in Patent Document 1, there is room for improvement regarding suppressing face problems caused by aging.

[0005] Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a mattress with a simple structure that can suppress face problems caused by aging.

Means for Solving the Problems

[0006] s s In order to solve the above problems, the mattress according to the present invention includes a concave portion into which a part of the back of the head of a person sleeping in a supine position fits, at least in a portion where the back of the head contacts, and the concave portion is configured such that the tip of the jaw of a person sleeping in a supine position is positioned above the forehead.

[0007] To solve the above problems, the mattress according to the present invention comprises a first portion on which the back of the head of a person sleeping on their back rests, a second portion on which the torso of a person sleeping on their back rests, and a third portion on which the legs of a person sleeping on their back rest. The first portion has a first end adjacent to the second portion in the longitudinal direction and a second end located on the opposite side of the longitudinal direction from the first end, and has a flat inclined surface that is inclined such that the first end is positioned above and the second end is positioned below. The inclined surface is configured such that the tip of the chin of a person sleeping on their back is positioned above the forehead. [Effects of the Invention]

[0008] The mattress according to the present invention has the above configuration, which can suppress facial problems that occur with aging, and can also provide a mattress with a simple structure. [Brief explanation of the drawing]

[0009] The drawings illustrate specific embodiments of the present invention relating to this disclosure, including not only essential components of the invention but also optional and preferred embodiments. [Figure 1] Figure 1 is a perspective view of a mattress according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view showing the usage condition of the mattress shown in Figure 1. [Figure 3] Figure 3 is an enlarged cross-sectional view, which is a magnified portion of Figure 2. [Figure 4] Figure 4 is a perspective view of the mattress according to the second embodiment. [Figure 5] Figure 5 is a cross-sectional view showing the usage condition of the mattress shown in Figure 4. [Figure 6] Figure 6 is an enlarged cross-sectional view, which is a magnified portion of Figure 5. [Figure 7] Figure 7 is a perspective view of a mattress according to the third embodiment, showing the mattress shown in Figure 4 with the first portion replaced by a spare first portion. [Figure 8]Figure 8 is a perspective view of the mattress according to the fourth embodiment. [Modes for carrying out the invention]

[0010] [Embodiment] Embodiments for carrying out the present invention will be described in detail below with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by those skilled in the art, and those that are substantially the same. Moreover, the components described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the present invention.

[0011] [First Embodiment] The mattress 1 according to this embodiment is, for example, a mattress 1 used as bedding. The mattress 1 according to this embodiment will be described below with reference to Figures 1 to 3.

[0012] Figure 1 is a perspective view of the mattress 1 according to the first embodiment. Figure 2 is a cross-sectional view showing the mattress 1 in use as shown in Figure 1. Figure 3 is an enlarged cross-sectional view of a part of Figure 2. In the usage state of the mattress 1 shown in Figures 1 to 3, a sheet is used to cover at least the upper surface in the vertical direction H of the mattress 1, but for the sake of explanation, the sheet is omitted in the mattress 1 shown in Figures 1 to 3.

[0013] The mattress 1 according to this embodiment comprises a main body 11 and a fitting member 12. The main body 11 is integrally formed in a substantially rectangular parallelepiped shape, having a first flat surface 11F on its upper side U in the vertical direction H that is large enough for, for example, an adult to lie on.

[0014] More specifically, the main body 11 will be described. As shown in FIG. 1, the main body 11 has a first portion 2, a second portion 3, and a third portion 4. As shown in FIG. 2, the first portion 2 is a portion on which the head (more specifically, the back of the head BH) of a human HU sleeping in a supine position mainly rests. The second portion 3 is a portion on which the torso TR of a human HU sleeping in a supine position mainly rests. The third portion 4 is a portion on which the legs LE of a human HU sleeping in a supine position mainly rests. In the main body 11 according to the present embodiment, as shown in FIGS. 1 and 2, the first portion 2, the second portion 3, and the third portion 4 are integrally formed.

[0015] The main body 11 and the fitting member 12 are formed including an elastic material, and are formed of a material that deforms when an object is placed on the upper side U in the vertical direction H.

[0016] As shown in FIG. 1, the mattress 1 according to the present embodiment has a longitudinal direction L, a vertical direction H, and a width direction W. The longitudinal direction L is the longitudinal direction of the mattress 1 and is the direction in which the body of the sleeping human HU extends. The vertical direction H is the thickness direction of the mattress 1. The width direction W is the short-side direction of the mattress 1. The longitudinal direction L, the vertical direction H, and the width direction W are perpendicular to each other. Also, the vertical direction H includes an upper side U which is one side of the vertical direction H and a lower side D which is the other side of the vertical direction H.

[0017] The main body 11 has a concave portion 24, and on the upper surface, the entire surface excluding the concave portion 24 has a flat first flat surface 11F. The first flat surface 11F is formed as a flat surface that extends along the horizontal direction without inclination.

[0018] By the way, the mattress 1 described in the above-mentioned Patent Document 1 has the following problems. Specifically, the problems of the mattress 1 described in Patent Document 1 will be described below.

[0019] When people look at each other's faces, they can sense the approximate age of the other person because the passage of time leaves its mark on a person's face. As we age, facial muscles sag and fine wrinkles appear, making us perceive our age. We know that Earth's gravity (G) affects a person's lifespan. The face is also constantly affected by gravity, and as we age, collagen in the skin is gradually lost, causing the skin to sag and muscles to decrease. As a result, gravity causes sagging and fine wrinkles under the eyes, deepening of nasolabial folds, and drooping of the mouth, all of which imprint the signs of age on the face.

[0020] During the day, a person (HU) is always standing or sitting in a chair, so gravity (G) is constantly applied downwards to their face. Furthermore, since the mattress 1 described in Patent Document 1 has an upper surface that is a flat surface that follows the horizontal plane, even during sleep at night, gravity (G) is applied to the face either directly downwards or still in a diagonally downward direction from the head to the feet (LE).

[0021] As a result, gravity (G) constantly applies force to the face either directly downwards in the vertical direction (H) or toward the legs (LE). Over many years, this force causes aging problems such as sagging facial muscles and the formation of fine wrinkles.

[0022] The mattress 1 according to this embodiment can suppress the problems caused by aging described above by having the following configuration.

[0023] The first portion 2 of the mattress 1 according to this embodiment has a recess 24. The recess 24 is located in a part that comes into contact with at least the occipital bone (BH) of a person HU sleeping on their back, and is a part into which a portion of the occipital bone (BH) fits.

[0024] The recess 24 comprises a recess body 241 formed in the shape of a frustocone and an extended portion 242 extending along the width direction W. The recess body 241 has a bottom surface 2411 at the bottom D in the vertical direction H, and is formed in the shape of a frustocone such that the area of ​​the bottom surface 2411 is smaller than the area of ​​the virtual top surface 2412 at the top U in the vertical direction H.

[0025] The recessed body 241 has, for example, a bottom surface 2411 located downward D, which is the other direction H in the recessed area 24, and a recessed side surface 2413 that rises diagonally from the bottom surface 2411 in the vertical direction H.

[0026] More specifically, the base surface 2411 is sloped in the longitudinal direction L such that the bottom is deeper at the end closer to the head and shallower at the end closer to the legs LE.

[0027] The bottom surface 2411 is the part (contact area) on which the occipital bone BH of a person HU lying on their back rests. The recessed side surface 2413 is the part (contact area) on which the temporal bone of a person HU lying on their back faces. The recess 24 is provided in the first part 2 in the part that contacts at least the occipital bone BH of a person HU lying on their back. A part of the occipital bone BH of a person HU lying on their back fits into the recess 24. The recess 24 is configured such that the tip CH1 of the chin CH of a person HU lying on their back is positioned above the forehead FH.

[0028] As described above, the mattress 1 according to this embodiment is provided with a recess 24 in which at least the occipital bone BH of a person HU lying on their back contacts the mattress, and a part of the occipital bone BH fits into the recess 24, and the recess 24 is configured such that the tip CH1 of the chin CH of the person HU lying on their back is located above the forehead FH. Therefore, when a person HU lies on their back on the mattress 1 according to this embodiment, the direction of the force applied to the skin and muscles of the face changes (more specifically, gravity G applies a diagonally downward force F1 to the face from the legs LE to the top of the head TH). As a result, in the mattress 1 according to this embodiment, when a person HU lies on their back on the mattress 1, as shown in Figure 3, gravity G applies a diagonally downward force F1 to the face from the legs LE to the top of the head TH, thereby suppressing sagging of the facial muscles and suppressing the formation of fine wrinkles on the face. Accordingly, the mattress 1 according to this embodiment can suppress facial problems that occur with aging. In addition, in the mattress 1 according to this embodiment, the main body 11 only has a recess 24, so the structure can be simplified.

[0029] If one were to lie on the mattress 1 according to this embodiment for even 3 to 4 hours each night, a force F1 could be applied to the face in a diagonal downward direction, from the legs LE to the top of the head TH, for 3 to 4 hours. Therefore, the mattress 1 according to this embodiment can suppress sagging of the facial muscles and suppress the formation of fine wrinkles on the face.

[0030] In addition, the mattress 1 according to this embodiment is provided with a recess 24 in the area where the neck and the back of the head BH come into contact when the person is lying on their back on the mattress 1, thereby creating a slight reclined position. As a result, when a person HU is lying on their back on the mattress 1 according to this embodiment, a diagonally downward force F1 is generated on the face from the legs LE to the top of the head TH, thereby suppressing aging.

[0031] Furthermore, in the mattress 1 according to this embodiment, a recess 24 is provided, allowing gravity G to apply a force F1 to the neck of a person (HU) in a diagonal downward direction from the legs LE to the top of the head TH. Therefore, with the mattress 1 according to this embodiment, when sleeping on one's back, a slight reclined position can be created at the point where the neck and the back of the head BH are in contact. As a result, when a person (HU) is sleeping on the mattress 1, the cervical spine can be stretched by applying a force F1 to the neck in a diagonal downward direction from the legs LE to the top of the head TH. Consequently, with the mattress 1 according to this embodiment, an appropriate force can be applied to a person (HU) who has little neck movement, such as a person (HU) who sits in a chair and operates a computer for long periods of time.

[0032] Furthermore, the mattress 1 according to this embodiment has recesses 24 into which a portion of the head and a portion of the neck of a human human being (HU) fits. Therefore, the mattress 1 according to this embodiment can generate a diagonally downward force F1 on the face over a long period of time, from the legs LE to the top of the head TH, thus further suppressing aging.

[0033] Furthermore, the base surface 2411 is inclined such that, in the vertical direction L, the base is deeper at the end closest to the head and shallower at the end closest to the leg portion LE. This configuration allows for the reliable application of a force F1 to the face in a diagonally downward direction from the leg portion LE towards the top of the head TH, as shown in Figure 3.

[0034] The mattress 1 according to this embodiment includes a fitting member 12, taking into consideration the force applied to the face and neck by gravity G, which may not be appropriate for human HU.

[0035] The fitting member 12 is fitted into the recess 24. The fitting member 12 has a second flat surface 12F1 on one side in the vertical direction H (upper U), and a fitting member curved surface 12F2 on the other side in the vertical direction (downward D) that contacts the recess curved surface 24F that forms the recess 24.

[0036] The fitting member 12 comprises a member body 121 formed in the shape of a frustocone and an extended portion 122 extending along the width direction W. The member body 121 has a base surface 1211 at the bottom D in the vertical direction H, and is formed in the shape of a frustocone such that the area of ​​the base surface 1211 is smaller than the area of ​​the second flat surface 12F1 at the top U in the vertical direction.

[0037] When the fitting member 12 is fitted into the recess 24, the curved surface 24F of the recess of the main body 11 and the curved surface 12F2 of the fitting member 12 come into contact, and a flat surface is formed over the entire upper U of the mattress 1 in the vertical direction H by the first flat surface 11F of the main body 11 and the second flat surface 12F1 of the fitting member 12. In other words, when the fitting member 12 is fitted into the recess 24, the entire mattress 1 can be returned to a flat mattress with a flat surface.

[0038] The mattress 1 according to this embodiment comprises a main body 11 having a recess 24 and a flat first flat surface 11F, and a fitting member 12 that fits into the recess 24. The fitting member 12 has a second flat surface 12F1 on one side in the vertical direction H (upper U), and a fitting member curved surface 12F2 on the other side in the vertical direction H (downward D) that contacts the recess curved surface 24F that forms the recess 24. When the fitting member 12 is fitted into the recess 24, the first flat surface 11F of the main body 11 and the second flat surface 12F1 of the fitting member 12 form a flat surface over the entire upper U side in the vertical direction H of both the main body 11 and the fitting member 12.

[0039] In this embodiment, the mattress 1 includes a second portion 3 on which the torso TR of a person HU lying on their back rests, and a third portion 4 on which the legs LE of a person HU lying on their back rest. Therefore, it is possible to prevent the sleeping person HU from sliding down the end of the mattress 1 that is closer to the head in the longitudinal direction H.

[0040] In the above-described embodiment, the mattress 1 was described as comprising a main body 11 and a fitting member 12. However, the mattress 1 according to this embodiment may consist only of the main body 11.

[0041] [Second Embodiment] Next, the mattress 1A according to the second embodiment will be described with reference to Figures 4 to 6. In the configuration of the mattress 1A according to the second embodiment, components that are the same as those in the configuration of the mattress 1 according to the first embodiment are denoted by the same reference numerals and their description is omitted.

[0042] Figure 4 is a perspective view of mattress 1A according to the second embodiment. Figure 5 is a cross-sectional view showing mattress 1A in use as shown in Figure 4. Figure 6 is an enlarged cross-sectional view showing a portion of Figure 5.

[0043] As shown in Figures 4 and 5, the mattress 1A according to this embodiment is formed with a first part 2A, a second part 3A, and a third part 4A as separate components.

[0044] Each of the first part 2A, the second part 3A, and the third part 4A is formed of an elastic material and is made of a material that deforms when an object is placed on it above U in the vertical direction H.

[0045] In the mattress 1A according to this embodiment, the length L 2H of the first portion 2A is shorter than the length L 3H of the second portion 3A, as shown in Figure 5. Furthermore, in the mattress 1A according to this embodiment, the length L 2H of the first portion 2A is shorter than the length L 4H of the third portion 4A.

[0046] An upper end surface 3F is formed on the upper part U in the vertical direction H of the second part 3A. The upper end surface 3F is formed flat and extends along the horizontal direction without inclination.

[0047] An upper end surface 4F is formed on the upper part U in the vertical direction H of the third part 4A. The upper end surface 4F is formed flat and extends along the horizontal direction without inclination.

[0048] In the vertical direction H, the height of the upper surface 3F of the second part 3A and the height of the upper surface 4F of the third part 4A are the same, and in the longitudinal direction L, no step is formed between the second part 3A and the third part 4A.

[0049] The first portion 2A has a first end 21 adjacent to the second portion 3A in the longitudinal direction L, and a second end 22 located on the opposite side of the first end 21 in the longitudinal direction L.

[0050] A first connecting means 61 is positioned between the first part 2A and the second part 3A. Specifically, the first connecting means 61 is a mechanical fastener means consisting of a hook element 611 and a loop element 612, where, for example, the loop element 612 is fixed to the first part 2 and the hook element 611 is fixed to the second part 3. More specifically, the mechanical fastener means has a fastener portion (loop element 612) located on the surface side exposed to the side of the first part 2A, and a receiving portion (hook element 611) located on the surface side exposed to the side of the second part 3A and detachably connected to the fastener portion (loop element 612).

[0051] In this embodiment, the mattress 1A can be detachably connected to the first part 2A and the second part 3A via the first connecting means 61, so that the connected state of the first part 2A and the second part 3A can be maintained. On the other hand, if a part of either the first part 2A or the second part 3A is damaged, the connection between the first part 2A and the second part 3A can be released by the first connecting means 61, and only the damaged part can be replaced.

[0052] A second connecting means 62 is positioned between the second part 3A and the third part 4A. More specifically, the second connecting means 62 is a mechanical fastener means consisting of a hook element 621 and a loop element 622, where, for example, the loop element 622 is fixed to the second part 3A and the hook element 621 is fixed to the third part 4A. More specifically, the mechanical fastener means has a fastener portion (loop element 622) located on the surface side exposed to the side of the second part 3A, and a receiving portion (hook element 621) located on the surface side exposed to the side of the third part 4A and detachably connected to the fastener portion (loop element 622).

[0053] In this embodiment, the mattress 1A can be detachably connected to the second portion 3A and the third portion 4A via the second connecting means 62, so that the second connecting means 62 can maintain the connected state of the second portion 3A and the third portion 4A. On the other hand, if a part of either the second portion 3A or the third portion 4A is damaged, the connection between the second portion 3A and the third portion 4A can be released by the second connecting means 62, and only the damaged part can be replaced.

[0054] As described above, the first portion 2A of the mattress 1A according to this embodiment has a recess 24 formed in the part that comes into contact with at least the occipital bone BH of a person HU lying on their back, into which a part of the occipital bone BH fits, and the recess 24 is configured such that the tip CH1 of the chin CH of a person HU lying on their back is positioned above the forehead FH U. Therefore, the mattress 1A according to this embodiment has the same function and effect as the mattress 1 described above. In addition, since the first portion 2A of the mattress 1A according to this embodiment only has an inclined surface 23F and a recess 24A, the structure can be simplified.

[0055] Furthermore, the mattress 1A according to this embodiment comprises a first portion 2A on which the occipital head BH of a person HU lying on their back rests, a second portion 3A on which the torso TR of a person HU lying on their back rests, and a third portion 4A on which the legs LE of a person HU lying on their back rest. The first portion 2A, the second portion 3A, and the third portion 4A are formed separately. The first portion 2A has a first end 21 adjacent to the second portion 3A in the vertical direction L, and a second end 22 located on the opposite side of the first end 21 in the vertical direction L. It has a flat inclined surface 23F that is inclined such that the first end 21 is located downward D and the second end 22 is located upward U.

[0056] In this embodiment, the mattress 1A includes a second portion 3A on which the torso TR of a person HU lying on their back rests, and a third portion 4A on which the legs LE of a person HU lying on their back rest. Therefore, it is possible to prevent the sleeping person HU from sliding down towards the second end 22 of the first portion 2A.

[0057] Furthermore, the mattress 1A according to this embodiment includes a first connecting means 61 that connects the first part 2A and the second part 3A, and a second connecting means 62 that connects the second part 3A and the third part 4A.

[0058] [Third Embodiment] Next, the mattress 1B according to the third embodiment will be described with reference to Figure 7. In the configuration of the mattress 1B according to the third embodiment, components that are the same as those in the configuration of the mattress 1A according to the second embodiment are denoted by the same reference numerals and their description is omitted.

[0059] Figure 7 is a perspective view of a mattress according to the third embodiment, showing the mattress 1B shown in Figure 4, with the first part 2A replaced by a spare first part 5. The mattress 1B according to this embodiment has a first part 2A, a second part 3A, a fourth part A, and a spare first part 5.

[0060] The length L in the vertical direction of the first spare part 5 is the same as the length L in the vertical direction of the first part 2A. Also, the length W in the width direction of the first spare part 5 is the same as the length W in the width direction of the first part 2A. Furthermore, the height H in the vertical direction of the first spare part 5 is the same as the height H in the vertical direction of the first end 21 in the first part 2A.

[0061] Furthermore, the preliminary first part 5 is formed from an elastic material, and is made of a material that deforms when an object is placed on its upper surface U in the vertical direction H. In other words, the material forming the preliminary first part 5 is the same as the material forming the first part 2A, the second part 3A, and the third part 4A, respectively.

[0062] Furthermore, an upper end surface 5F is formed on the upper part U in the vertical direction H of the preliminary first portion 5, which is flat without inclination and extends along the horizontal direction.

[0063] In the vertical direction H, the height of the upper end surface 5F of the preliminary first part 5 and the height of the upper end surface 3F of the second part 3 are the same, and in the vertical direction L, no step is formed between the preliminary first part 5 and the second part 3.

[0064] Furthermore, the mattress 1B according to this embodiment has a spare first part 5 on which the back of the head BH of a person HU sleeping on their back rests, and the first part 2A and the spare first part 5 are interchangeable, and the entire upper surface of the spare first part 5 is configured to have a flat end surface 5F that extends along the horizontal direction. In other words, the mattress 1B according to this embodiment has a spare first part 5 that is interchangeable with the first part 2A, and can be divided into multiple parts. And, for a person HU for whom the force applied to the face and neck by gravity G is not appropriate, the first part 2A can be changed to the spare first part 5 having a flat surface 5F on the upper U side, which is one side in the vertical direction H, thereby returning the whole to a flat mattress 1B with a flat surface.

[0065] [Fourth Embodiment] Next, the mattress 1C according to the fourth embodiment will be described with reference to Figure 8. In the configuration of the mattress 1C according to the fourth embodiment, components that are the same as those in the mattress 1A according to the second embodiment are denoted by the same reference numerals and their description is omitted.

[0066] Figure 8 is a perspective view of the mattress 1C according to the fourth embodiment. The first portion 2C of the mattress 1C according to this embodiment does not have the recess 24 that the mattress 1A according to the second embodiment had, and the entire upper surface located in the upper U in the vertical direction is formed as an inclined flat surface 23F.

[0067] Furthermore, the mattress 1C according to this embodiment comprises a first portion 2C on which the occipital head BH of a person HU lying on their back rests, a second portion 3A on which the torso TR of a person HU lying on their back rests, and a third portion 4A on which the legs LE of a person HU lying on their back rest. The first portion 2C has a first end 21 adjacent to the second portion 3A in the longitudinal direction L, and a second end 22 located on the opposite side of the first end 21 in the longitudinal direction L. It has a flat inclined surface 23F that is inclined such that the first end 21 is located above U and the second end 22 is located below D. The inclined surface 23F is configured such that the tip CH1 of the chin CH of a person HU lying on their back is located above U than the forehead FH.

[0068] Because the mattress 1C according to this embodiment has the above configuration, it provides the same functions and effects as the mattress 1A according to the second embodiment. Furthermore, the mattress 1C according to this embodiment can suppress the occurrence of a gap between the neck of the human HU and the inclined surface 23F of the first part 2C.

[0069] The above description is based on embodiments of mattresses 1, 1A, 1B, and 1C according to the present invention. However, the present invention is not limited to these embodiments, and various modifications are possible without departing from the spirit of the invention. Furthermore, the present invention also includes configurations that appropriately combine some of the components of the above-described embodiments. Such configurations that make various modifications without departing from the spirit of the invention are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims. [Explanation of Symbols]

[0070] 1, 1A, 1B, 1C Mattress 11 Main unit 11F 1st flat surface 12. Insertion component 12F1 2nd flat surface 12F2 Curved surface of component 2, 2A Part 1 21 First end 22 Second end 23F Slope 24 recesses 24F Recessed Curved Surface 3, 3A 2nd part 4, 4A 3rd part 5. Reserve Part 1 5F flat surface 61 First connection means 62 Second connection means D Downward (the other direction in the up and down direction) H Vertical direction U Upward (one direction, up or down)

Claims

1. The part of the body that comes into contact with at least the back of the head of a person sleeping on their back is provided with a recess into which a portion of the back of the head fits, The mattress is characterized by having a recess that is configured so that the tip of the chin of a person sleeping on their back is positioned above the forehead.

2. A body having the aforementioned recess and a flat first flat surface, A fitting member that is fitted into the recess, Equipped with, The aforementioned fitting member has a second flat surface on one side in the vertical direction, and a fitting member curved surface on the other side in the vertical direction that contacts the recessed curved surface forming the recess. When the fitting member is fitted into the recess, the first flat surface of the main body and the second flat surface of the fitting member form a flat surface over the entire upper surface of both the main body and the fitting member in the vertical direction. The mattress according to claim 1.

3. The first part on which the back of the head of a person sleeping on their back rests, The second part is where the torso of a person lying on their back rests, The third part is where the legs of a person lying on their back rest, Equipped with, The first part, the second part, and the third part are formed integrally. The mattress according to claim 1.

4. The first part on which the back of the head of a person sleeping on their back rests, The second part is where the torso of a person lying on their back rests, The third part is where the legs of a person lying on their back rest, Equipped with, The first part, the second part, and the third part are formed separately. The first portion has a first end adjacent to the second portion in the longitudinal direction, and a second end located on the opposite side in the longitudinal direction from the first end. The mattress according to claim 1, having a flat inclined surface that is inclined such that the first end is located upward and the second end is located downward.

5. The first part is where the back of a person's head rests when they are lying on their back, The second part is where the torso of a person lying on their back rests, The third part is where the legs of a person lying on their back rest, Equipped with, The first part is, It has a first end adjacent to the second portion in the longitudinal direction, and a second end located on the opposite side in the longitudinal direction from the first end, It has a flat inclined surface that is inclined such that the first end is located upward and the second end is located downward, The mattress is characterized in that the inclined surface is configured such that the tip of the chin of a person lying on their back is positioned above the forehead.

6. A first connecting means for connecting the first part and the second part, A second connecting means for connecting the second part and the third part, A mattress according to claim 3 or 5, comprising the features described above.

7. It has a first reserve portion on which the back of the head of a person sleeping on their back rests, The first part and the spare first part are configured to be interchangeable. The mattress according to claim 3 or 5, wherein the entire upper surface of the aforementioned first spare portion is configured to have a flat surface along the horizontal direction.

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