Absorbent products

Abstract

The purpose of the present invention is to obtain an absorbent article that has stable absorbability when worn and is more comfortable to use by preventing liquid leakage and stuffiness, the absorbent article enabling the natural absorbability of an absorption core to be fully exhibited and the leakage of liquid such as excreted liquid and stuffiness when worn to be stably suppressed. More specifically, an absorber (13) is configured to be provided with an absorption core (15) which extends in the length direction of the absorber (13) and absorbs and holds liquid, and a covering sheet (16) which has liquid permeability and is wrapped around the outer peripheral surface of the absorption core (15) about the axis in the length direction of the absorption core (15), the covering sheet (16) has extension parts (18) each of which extends from an end in the width direction of the absorption core (15) and the inner peripheral surface side of each of which is not in contact with a liquid permeable sheet (11)-side surface and a liquid impermeable sheet (12)-side surface of the absorption core (15), and an absorbent material (19) having liquid absorbability is bonded to the inner peripheral surface side of each of the extension parts (18) by a bonding agent.

Description

The present invention relates to absorbent articles, and particularly to absorbent articles suitable for use as disposable diapers. As an absorbent article, for example, a disposable diaper that absorbs excretions such as urine is composed of a liquid-permeable sheet (so-called top sheet) located on the skin side of the wearer and a liquid-impermeable sheet (so-called top sheet) located on the clothing side. back sheet) and an absorbent body elongated in one direction provided between the liquid-permeable sheet and the liquid-impermeable sheet. The absorbent body includes an absorbent core extending in the longitudinal direction of the absorbent body and absorbing and holding liquid such as excrement, and an absorbent core covering the outer peripheral surface of the absorbent core and adhered to the absorbent core. , and a liquid-permeable covering sheet. Since the absorbent core is formed by laminating a water absorbent material such as pulp and a highly absorbent material such as a water absorbent polymer, it is relatively easy to lose its shape. Therefore, the covering sheet has the function of covering the outer peripheral surface of the absorbent core to retain the shape of the absorbent core and, by extension, the shape of the entire absorbent body. On the other hand, when the absorbent core absorbs and retains liquid such as excretions, it expands as a whole. At this time, the covering sheet covering the absorbent core suppresses the expansion of the absorbent core, As a result, the expected amount of liquid cannot be absorbed, and the absorption power of the absorbent core cannot be fully exhibited. For this reason, as described in Patent Document 1, for example, the absorbent body is arranged to cover the covering sheet so that a space separated from the absorbent core is formed at both ends in the width direction of the absorbent core. It is widely known that the cover sheet is wound around a core and has a configuration in which the inner peripheral surface of the portion of the cover sheet forming the space is not coated with an adhesive. In the case of the device described in Patent Document 1, the portion of the covering sheet that forms the space is not adhered to the absorbent core and does not restrain the movement of the absorbent core, so that the absorbent core absorbs excreted liquids and the like. Even if the absorbent core expands, the space portion serves as a bulging margin and does not suppress the expansion of the absorbent core. As a result, there is an advantage that the original absorption capacity can be easily exhibited without impairing the absorbency of the absorbent core. However, since the cover sheet itself has excellent liquid permeability but poor absorbency, in the case of the cover sheet described in Patent Document 1, the part of the cover sheet that forms the space has almost no absorbency. ing. When some pressure acts on the absorbent core, such as when the wearer of the disposable diaper sits down, part of the liquid once absorbed may be pushed out and flow out. Since the covering sheet cannot absorb the spilled liquid, it is conceivable that the liquid may leak to the outside of the absorbent body. In addition, when the wearer of the disposable diaper sweats, the space part can hardly absorb the sweat due to the absence of the absorbent core, so the humidity inside the disposable diaper increases and becomes stuffy. there is a possibility. JP 2013-99451 A The technical problem of the present invention is to make it possible to sufficiently exert the original absorption power of the absorbent core, and to stably prevent leakage of liquid such as excrement fluid and stuffiness during wearing. To provide an absorptive article having both stable absorptivity and a good feeling of use due to prevention of liquid leakage and stuffiness. In order to solve the above problems, the absorbent article of the present invention comprises a liquid-permeable sheet, a liquid-impermeable sheet disposed on one side of the liquid-permeable sheet, and these liquid-permeable sheets and the liquid-impermeable sheet. and an absorbent body that is long in one direction and disposed between a permeable sheet, wherein the absorbent body absorbs and retains liquid and extends in the length direction of the absorbent body. A core and a liquid-permeable covering sheet wound around an axis in the length direction of the absorbent core on the outer peripheral surface of the absorbent core, wherein the covering sheet extends in the width direction of the absorbent core. The absorbent core has an extension portion extending from the end portion and having an inner peripheral surface side that is not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core, An absorbent material having liquid absorption properties is adhered to the inner peripheral surface of the projecting portion with an adhesive. The absorbent core has, at both ends thereof in the width direction, leg relief portions that are curved so as to be convex toward the center side in the width direction of the absorbent core, and the covering sheet extends from the leg relief portions. It is wound around the absorbent core in a state of extending outward in the width direction of the absorbent body, and the portion of the covering sheet extending from the leg hole serves as the extending portion. be able to. In this case, the absorbent article comprises a pair of leak-proof walls extending in the longitudinal direction of the absorbent body, which can be raised on the side of the liquid-permeable sheet opposite to the absorbent body. In addition, the pair of leak-proof walls can be raised with a base end portion corresponding to the portion located closest to the center in the width direction of the absorbent body in the leg hole of the absorbent body. is preferred. In the present invention, the absorbent material may be adhered to the entire inner peripheral surface of the extending portion. Further, in the present invention, the covering sheet is preferably wound around the absorbent core in a forehead shape. Further, in the present invention, the covering sheet has an overlapping portion in which both end portions in the winding direction of the absorbent core are overlapped and connected to each other by an adhesive, and the overlapping portion comprises: It is fixed to the liquid-permeable sheet side of the absorbent core, and the absorbent material is provided between one end side and the other end side of the cover sheet in the direction in which it is wound around the absorbent core, in the overlapping portion. can be arranged. In the present invention, the covering sheet has a pair of longitudinally extending portions extending from both ends in the lengthwise direction of the absorbent core. An absorbent material having liquid absorption properties may be adhered to the peripheral surface side with an adhesive. In this case, the absorbent article includes a crotch sheet member having the absorbent body and covering the crotch of the wearer, which is long in one direction, and which is joined to one end in the length direction of the crotch sheet member. a disposable diaper comprising: an abdominal sheet member covering the abdomen of a wearer; and a back sheet member joined to the other end in the longitudinal direction of the crotch sheet member and covering the back of the wearer. wherein the abdominal sheet member has a plurality of abdominal elastic members extending in a direction perpendicular to the length direction of the crotch sheet member and along the sheet surface of the abdominal sheet member; The dorsal sheet member has a plurality of dorsal elastic members extending in a direction perpendicular to the length direction of the crotch sheet member and along the sheet surface of the dorsal sheet member. and at least one of the portion of the dorsal elastic member, of the pair of length direction side extension portions of the covering sheet, the position corresponding to the most recent length direction side extension portion can be arranged so as to overlap. At this time, among the pair of length direction side extension portions, the length direction side extension portion located on the ventral sheet member side has a basis weight of the absorbent material adhered to the inner peripheral surface side. , the number of longitudinal side extensions located on the side of the back sheet member. According to the present invention, the covering sheet wound around the outer peripheral surface of the absorbent core around the axis in the length direction of the absorbent core extends from the end in the width direction of the absorbent core and the inner peripheral surface side of the absorbent core extends from the absorbent core. The liquid-permeable sheet-side surface of the core and the liquid-impermeable sheet-side surface of the core have an extending portion that is not in contact with each other, and the inner peripheral surface of the extending portion has a liquid-absorbing is adhered by an adhesive. Therefore, when the absorbent core swells due to absorption of liquid such as excrement, the extension part serves as a swell margin for the absorbent core, so that expansion of the absorbent core is not hindered. It is possible to fully exhibit the original absorption power. Moreover, since the absorbent material is adhered to the inner peripheral surface of the extending portion, even if the liquid once absorbed from the absorbent core oozes out to the extending portion, the absorbent material can absorb the liquid. It is absorbed again, and even if sweat of the wearer of the absorbent article adheres to the extension, the absorbent material absorbs it. As a result, it is possible to stably prevent leakage of liquid such as excretory fluid and dampness during wearing. Therefore, it is possible to ensure both stable absorption when worn and a good feeling of use by preventing liquid leakage and stuffiness at the same time. FIG. 1 is a partially broken perspective view schematically showing one embodiment of a disposable diaper according to the present invention. FIG. 2 is a schematic perspective view of one embodiment of the disposable diaper according to the present invention, viewed from a position different from that of FIG. FIG. 3 is a plan view schematically showing the unfolded state of the disposable diaper of FIG. However, the state seen from the liquid-permeable sheet side of the crotch sheet member is shown. FIG. 4 is a schematic enlarged end view of the main part of the absorber. However, it shows a state in which the central portion of the absorbent body in the length direction is cut in a direction perpendicular to the length direction of the absorbent body. FIG. 5 is a schematic cross-sectional view of the main part of the absorbent body at a position different from that in FIG. However, it shows a state in which the absorber is cut at a substantially central portion in the thickness direction of the absorber. FIG. 6 is a schematic enlarged cross-sectional view of the main part of the disposable diaper of FIG. 1 cut at the center of the crotch sheet member in the length direction of the crotch sheet member. FIG. 7 shows a state in which the disposable diaper shown in FIG. 1 is unfolded, and the first adhesive application area of ​​the first adhesive portion and the second adhesive application area of ​​the second adhesive portion are crossed and joined together. It is a figure which shows typically. FIG. 8 is a schematic diagram of an outline of an apparatus for forming a continuous body of absorbent bodies. FIG. 9 is a diagram schematically showing each stage of forming a continuous body of absorbent bodies. However, in the process of forming the continuous body of the absorbent, (a) a plan view of the main parts schematically showing the state during the coating process, (b) a plan view of the main parts schematically showing the state during the placing process, ( (c) A perspective view schematically showing a state during a bending process, and (d) a cross-sectional view schematically showing a state during a pressing process. FIG. 10 is a diagram explaining the steps of manufacturing the disposable diaper according to the present invention. FIG. 11 is a schematic enlarged cross-sectional view of a main part showing an absorbent body having a form different from that of FIG. However, it shows a state in which the central portion of the absorbent body in the length direction is cut in a direction perpendicular to the length direction of the absorbent body. 1 to 7 show one embodiment of the absorbent article of the present invention. In this embodiment, the absorbent article is a disposable diaper. That is, the disposable diaper 1 of this embodiment is of a so-called three-piece type mainly composed of three substantially rectangular sheet members covering the wearer's abdomen, back, and crotch. Specifically, the disposable diaper 1 includes a crotch sheet member 2 that covers the wearer's crotch and is long in one direction, and the crotch sheet member 2 is overlapped with the crotch sheet member 2 at one end in the length direction. It is provided with a ventral sheet member 3 that covers the ventral side of the wearer and is joined in a folded state. Furthermore, as a separate member from the abdominal side sheet member 3, the wearer's back is joined to the other end side in the length direction of the crotch sheet member 2 in a state of being overlapped with the crotch sheet member 2. and a dorsal sheet member 4 covering the sides. The crotch sheet member 2, the ventral sheet member 3, and the dorsal sheet member 4 are joined to each other with an adhesive at the overlapping portions. As shown in FIGS. 1 and 2, the disposable diaper 1 is a so-called underpants type in which the abdominal sheet member 3 and the dorsal sheet member 4 are joined by various means such as fusion bonding. When this disposable diaper 1 is worn (in a standing position), a waist opening 1a is formed by the abdominal sheet member 3 and the back sheet member 4 on the upper side, and the abdominal sheet member 3 and the back sheet member 4 are formed on the lower side. The back sheet member 4 and the crotch sheet member 2 form a pair of leg openings 1b, 1b through which the wearer's legs are passed. Both ends of the crotch sheet member 2 are covered with a flexible material that covers the seams of the abdominal sheet member 3 and the dorsal sheet member 4 that are joined to the crotch sheet member 2 to improve the feel of the skin. and a band-shaped cover sheet member 6 made of nonwoven fabric having excellent air permeability is attached to each of them. The crotch sheet member 2 is formed in a substantially rectangular shape in plan view, extending long from the abdominal sheet member 3 toward the dorsal sheet member 4 through the lower side of the wearer's crotch. The crotch sheet member 2 includes a liquid-permeable sheet 11 (so-called top sheet) positioned on the wearer's skin side and extending in the length direction of the crotch sheet member 2, A liquid-impermeable sheet 12 (so-called back sheet) having liquid-impermeability is positioned on the side opposite to the skin side of the wearer and extends in the longitudinal direction of the crotch sheet member 2 . Furthermore, the crotch sheet member 2 is disposed between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12, and absorbs and retains excreted fluid such as urine excreted by the wearer. It has an absorber 13 that extends in the length direction of the crotch sheet member 2 and a pair of leak-proof walls 14 that extend in the length direction of the crotch sheet member 2 along the absorber 13 . . Then, the liquid-impermeable sheet 12 and the abdominal sheet member 3 and the dorsal sheet member 4 are adhered to each of the portions where the crotch sheet member 2, the ventral sheet member 3 and the dorsal sheet member 4 are overlapped. directly bonded by an agent. The liquid-permeable sheet 11 is in contact with the wearer's skin and quickly absorbs the wearer's urine and transfers it to the absorber 13. is formed in a substantially rectangular shape in plan view and is larger than the absorbent body 13 as a whole, and is joined to the absorbent body 13 by any joining means such as adhesion using a hot-melt adhesive. . The liquid-impermeable sheet 12 prevents permeation of the excreted liquid and prevents leakage of the excreted liquid to the outside. The absorber 13 and the liquid-permeable sheet 11 are joined to each other by means. The liquid-impermeable sheet 12 is elongated in one direction, specifically in the length direction of the absorbent body 13, and is formed in a generally rectangular shape in plan view that is larger than the absorbent body 13 as a whole. The absorber 13 and the liquid-permeable sheet 11 are joined to each other by any joining means such as bonding with an adhesive. Further, the absorbent body 13 has an absorbent core 15 that substantially absorbs and retains the excreted liquid, and a liquid-permeable covering sheet 16 that covers the outer surface of the absorbent core 15 . The cover sheet 16 has a substantially rectangular sheet surface in a plan view when unfolded, and the outer peripheral surface of the absorbent core 15 (liquid-permeable sheet side and liquid-impermeable sheet side of the absorbent core, and the absorbent core) 15 in the width direction of the absorbent core 15) around the longitudinal axis of the absorbent core 15 over the entire outer peripheral surface of the absorbent core 15 and wound around the absorbent core 15. In this case, the length of the absorbent core 15 in the longitudinal direction is sufficiently longer than the length of the absorbent core 15 in the longitudinal direction. The covering sheet 16 is made of, for example, a tissue or the like that is mainly made of pulverized pulp and is molded by a wet method. On the other hand, the absorbent core 15 includes a water-absorbent material such as pulp and a highly absorbent material such as a water-absorbent polymer. It is formed in a belt shape extending in the direction of the side sheet member 4 side, that is, along the length direction of the crotch sheet member 2 and having a constant thickness. Moreover, as shown in FIGS. 3 and 5, the absorbent core 15 is provided at both ends thereof in the width direction so that the absorbent body 13 can easily fit to the base of the wearer's thighs. Leg recesses 17, 17 are formed so as to be convex toward the center in the width direction of the absorbent core 15, respectively. In this embodiment, the leg recesses 17, 17 are formed such that the central portion in the length direction of the absorbent core 15 is the apex of the curved portion. Therefore, when the absorbent core 15 is viewed from the side of the liquid-permeable sheet 11 (hereinafter referred to as "plan view"), the absorbent core 15 has a shape in which the central portion in the length direction is narrowest (so-called hourglass shape). In addition, the absorbent core 15 has a curved surface with four corners chamfered in a plan view. In the present invention, the water-absorbing material forming the absorbent core includes, for example, wood pulp, mercerized pulp, or cross-linked pulp obtained from coniferous or broad-leaved trees, non-wood pulp, regenerated cellulose such as rayon, acetate, and the like. and semi-synthetic cellulose. Examples of the superabsorbent material include starch-based, cellulose-based, and synthetic polymer-based superabsorbent materials. Starch-based or cellulose-based superabsorbent materials include, for example, starch-acrylic acid (salt) graft copolymers, and synthetic polymer-based superabsorbent materials include, for example, polyacrylates (especially , sodium polyacrylate-based) super absorbent polymer (SAP). The shape of the superabsorbent material includes, for example, particulate, fibrous, scale-like, etc. In the case of particulate, the particle size is preferably 50 to 1000 μm, more preferably 100 to 600 μm. . On the outer peripheral surface of the absorbent core 15, the covering sheet 16 is arranged around the longitudinal axis of the absorbent core 15, that is, the surface of the absorbent core 15 on the side of the liquid-permeable sheet 11 and the liquid-impermeable sheet. It is wound so as to surround the surface on the side of the permeable sheet 12 and both sides in the width direction. The surface of the absorbent core 15 on the side of the liquid-permeable sheet 11 and the surface of the liquid-impermeable sheet 12 on the side of the liquid-impermeable sheet 12 and the covering sheet 16 are adhered to each other with an adhesive. The cover sheet 16 is adhered to each other. As the adhesive, any adhesive can be used as long as it can reliably and stably bond the absorbent core 15 and the covering sheet 16, but a hot-melt adhesive is most preferable. Examples of hot-melt adhesives include polyolefin-based, ethylene-vinyl acetate copolymer-based, and synthetic rubber-based adhesives. As another adhesive, an acrylic resin adhesive can be used. Moreover, in this embodiment, as shown in FIGS. 4 and 5, the cover sheet 16 is wrapped around the absorbent core 15, that is, each corner of the maximum width portion W of the absorbent core 15 is wrapped. At the portion 15a, it is folded along a straight line extending in the longitudinal direction of the absorbent core 15, and wrapped around the absorbent core 15 from the liquid-impermeable sheet side to the liquid-permeable sheet side. Rolled. Therefore, the covering sheet 16 is wrapped around the absorbent core 15 so that the absorbent body 13 as a whole has a substantially rectangular shape in plan view. Here, in a state in which the covering sheet 16 is wound around the absorbent core 15 , the covering sheet 16 extends from the widthwise end of the absorbent core 15 and the inner peripheral surface side is the liquid-permeable sheet 11 side of the absorbent core 15 . and the surface on the side of the liquid-impermeable sheet 12 and an extending portion 18 which are not in contact with each other. In this embodiment, as described above, the cover sheet 16 is wrapped around the absorbent core 15 in a forehead shape so that the absorbent body 13 as a whole has a substantially rectangular shape in plan view. Since it is wound around the absorbent core 15, the extensions 18 are formed at the portions of the absorbent core 15 where the leg recesses 17 are provided. That is, the cover sheet 16 is wound around the absorbent core 15 in a state of extending outward in the width direction of the absorbent body 13 from the leg hole portion 17, and the leg hole portion of the cover sheet 16 extends outward. The portion extending from 17 is the extending portion 18 . Specifically, as described above, the leg holes 17, 17 are curved so as to project toward the center of the absorbent core 15 in the width direction. Therefore, the covering sheet 16 extends outward in the width direction of the absorbent body 13 from the leg holes 17, 17 at the portions where the leg holes 17, 17 are provided, and the inner circumference Extending portions are formed, the surface sides of which are not in contact with the surface of the absorbent core 15 on the side of the liquid permeable sheet 11 and the surface of the absorbent core 15 on the side of the liquid impermeable sheet 12, and these extending portions are the extending portions 18 , 18 . The extending portion 18 is not adhered to the absorbent core 15 and does not restrict the movement of the absorbent core 15 . In this embodiment, as shown in FIGS. 4 and 5, the inner peripheral surface side of the extending portion 18 is basically not in contact with the absorbent core 15 and is a hollow space. is formed. In addition, an absorbent material 19 separate from the absorbent core 15 having liquid absorption properties is attached to the inner peripheral surface side of the extending portions 18, 18, that is, the surface side on the absorbent core 15 side by an adhesive. Glued. The absorbent material 19 is the same material as the water absorbent material and the super absorbent material used in the absorbent core 15, and the SAP is particularly preferred. The absorbent material 19 may be pulp other than SAP, or may be both SAP and pulp. The adhesive is the same as the adhesive that bonds the absorbent core 15 and the cover sheet 16 together, and is most preferably a hot-melt adhesive. In this embodiment, the absorbent material 19 is basically adhered to the entire inner peripheral surfaces of the extensions 18,18. Therefore, when the disposable diaper 1 is worn (when the wearer is in a standing position), the absorbent material 19 is positioned upward on the inner peripheral surface side of the extensions 18, that is, the extensions The liquid-impermeable sheet 12 side is adhered to the inner peripheral surface side of 18 , 18 . Similarly, it is adhered to the downward region on the inner peripheral surface side of the extending portions 18, 18, that is, the region on the liquid permeable sheet 11 side on the inner peripheral surface side of the extending portions 18, 18. there is In the present invention, the term "the absorbent material is adhered to the entire inner peripheral surface of the extending portion" means that the absorbent material is evenly spread over the entire inner peripheral surface of the extending portion. In addition to the case where the extensions are adhered to the inner peripheral surface in a state of being unevenly distributed over the entire surface of the inner peripheral surface of the extension portion, this includes the case where the extension portions are adhered to the inner peripheral surface. Furthermore, in this embodiment, the absorbent material 19 is also disposed between the liquid-permeable sheet 11 side of the absorbent core 15 and the liquid-permeable sheet 11 in an adhered state, Substantially, the absorbent material 19 is interposed between the absorbent core 15 and the liquid-permeable sheet 11 . As a result, the absorbent material 19 is always present in the portion of the absorbent body 13 that is in contact with the covering sheet 16 in the liquid-permeable sheet 11, so that the wearer wearing the disposable diaper 1 can use the disposable diaper. 1, the absorbent material 19 can quickly absorb moisture such as perspiration contained in the liquid-permeable sheet 11 and the covering sheet 16 when sweating or humidity increases. Therefore, the liquid-permeable sheet 11 can be kept dry, and the environment inside the disposable diaper 1 can be suppressed from being wet. The covering sheet 16 has overlapping portions 20 extending in the longitudinal direction of the absorbent body 13, which are connected to each other by an adhesive in a state in which both end portions in the winding direction of the absorbent core 15 are overlapped. doing. The overlapping portion 20 is fixed to the liquid permeable sheet 11 side of the absorbent core 15 . Further, in the overlapping portion 20, the absorbent material 19 is arranged between one end side and the other end side of the covering sheet 16 constituting the overlapping portion 20 in the direction of winding around the absorbent core 15. It is More specifically, the cover sheet 16 has both ends in the winding direction around the absorbent core 15 folded along the surface of the absorbent core 15 on the liquid permeable sheet 11 side, and the liquid permeable sheet By overlapping on the surface on the 11 side, the overlapping portion 20 is formed. Then, the absorbent material 19 is adhered within the overlapping portion 20, that is, between one end side and the other end side of the covering sheet 16 in the direction wound around the absorbent core 15, which forms the overlapping portion 20. It is interposed in a state where In addition, in the case of this embodiment, the overlapping portion 20 is positioned substantially at the center of the absorbent core 15 in the width direction on the side of the liquid-permeable sheet 11 of the absorbent core 15 . In this way, the overlapping portion 20 is arranged on the liquid-permeable sheet 11 side of the absorbent core 15 and the absorbent material 19 is arranged in the overlapping portion 20 because the disposable diaper 1 is worn. This is because the absorptive material 19 efficiently absorbs perspiration from the buttocks of the wearer. More specifically, a wearer wearing the disposable diaper tends to sweat in the widthwise central portion of the buttocks (gluteal cleft). It is desirable to increase the liquid absorption capacity in the portion corresponding to the gluteal cleft. Therefore, in this embodiment, the overlapping portion 20 of the covering sheet 16 is arranged on the liquid-permeable sheet 11 side of the absorbent core 15, and the absorbent material is placed in the overlapping portion 20. By arranging 19, the liquid-absorbing ability of the liquid-permeable sheet side of the absorbent body 13 corresponding to the gluteal cleft of the wearer is enhanced, and the sweat of the gluteal cleft can be efficiently absorbed. I have to. In particular, in this embodiment, the overlapping portion 20 is positioned substantially in the center of the width direction of the absorbent core 15 on the side of the liquid-permeable sheet 11 of the absorbent core 15, so that the absorbent core 15 is more stable and effective. It is possible to absorb the sweat of the gluteal cleft part. The pair of leak-proof walls 14, 14 rises toward the surface of the liquid-permeable sheet 11 opposite to the absorber 13, that is, toward the skin surface of the wearer when worn, and the tip end of the sheet 14 is the wearer's skin surface. By contacting the skin surface, it prevents excretions from leaking out from between the wearer's skin surface and the crotch sheet member 2 . It should be noted that the pair of leak-proof walls 14, 14 is preferably hydrophobic or water-repellent so as to prevent leakage of excreted fluid. Can be configured. Further, on the upper end side of each of the leak-proof walls 14, 14, elastic members 14a, 14a for the leak-proof wall, such as thread-like rubber, are arranged, extending in the longitudinal direction of the respective leak-proof walls 14, 14. As a result, the leak-proof walls 14, 14 are elastically raised, and the leak-proof walls 14, 14 are easily brought into close contact with the wearer's skin. When the pair of leak-proof walls 14, 14 are in an upright state, the base ends thereof are located on the outer side in the width direction of the crotch sheet member 2 with respect to the positions of both ends in the width direction of the absorber 13. placed in position. In this embodiment, as described above, the absorbent core 15 of the absorbent body 13 has leg openings that are curved so as to be convex toward the center side in the width direction of the absorbent core 15 at both widthwise end sides. Since the portions 17, 17 are provided, the base end portions of the pair of leak-proof walls 14, 14 conform to the shape of the leg holes 17, 17. It is designed to stand up like this. In particular, with regard to the portions of the leg hollow portions 17, 17 that are positioned closest to the center in the width direction of the absorbent body 13, the position corresponding to the portion positioned closest to the center in the width direction of the absorbent body 13 is the base end portion. The pair of leak-proof walls 14, 14 can be raised according to the shape of the inner thigh portion of the wearer of the disposable diaper 1. As shown in FIG. At this time, as shown in FIG. 6 , as the leakage prevention wall 14 rises, the extension portion 18 is moved to the opposite side of the liquid permeable sheet 11 from the absorber 13 by the leakage prevention wall 14 . is pushed up in the direction of the face side of the wearer, that is, the wearer's skin face side. At that time, the extending portion 18 is in a deformed state in which the space on the inner peripheral surface side of the extending portion 18 is crushed along the wall surface of the leakage preventing wall 14 . As a result, since the extending portion 18 has a shape along the inner thigh portion of the wearer of the disposable diaper 1, the inner thigh portion is one of the portions where the wearer wearing the disposable diaper 1 tends to sweat. The absorbent material 19 of the extending portion 18 can absorb sweat from the base of the leg and its vicinity. As a result, the feeling of use of the disposable diaper 1 can be better maintained, and the environment inside the disposable diaper 1 can be effectively suppressed from being wet. By the way, the cover sheet 16 is formed with a pair of lengthwise extending portions 21 and 22 extending from both ends in the lengthwise direction of the absorbent core 15 when wound around the absorbent core 15 . It is Specifically, the pair of lengthwise extending portions 21 and 22 will be described. When folded, the length of the absorbent core 15 along the length direction is sufficiently longer than the length of the absorbent core 15 in the length direction. As a result, the covering sheet 16 wound around the absorbent core 15 protrudes from both ends in the longitudinal direction of the absorbent core 15 in the direction of the ventral sheet member and the direction of the dorsal sheet member of the absorbent core 15. An extended portion is formed as follows. Accordingly, these extending portions are a ventral lengthwise extension portion 21 extending in the ventral sheet member direction and a dorsal lengthwise extension portion extending in the dorsal sheet member direction. It becomes part 22 . In this embodiment, it is assumed that the ventral lengthwise extension portion 21 and the dorsal lengthwise extension portion 22 have approximately the same length in the lengthwise direction of the absorbent core 15 . It's becoming In addition, the ventral longitudinally extending portion 21 and the dorsal longitudinally extending portion 22 are located on the free end sides of the absorbent core 15 in the longitudinal direction (opposite side to the absorbent core 15). ) is in an open state (unclosed state) when the covering sheet 16 is wrapped around the absorbent core 15 . However, the absorber 13 is arranged between the liquid-permeable sheet 11 and the liquid-impermeable sheet 12, and the liquid-permeable sheet 11 and the liquid-impermeable sheet 12 are arranged at their peripheral edges. When the portions are joined together, the free end sides of the absorbent core 15 in the longitudinal direction at the longitudinally extending portion 21 on the ventral side and the longitudinally extending portion 22 on the dorsal side are also joined together. It will be joined and closed. In addition, the absorbent material 19 having liquid absorption properties is adhered to the inner peripheral surfaces of the pair of longitudinally extending portions 21 and 22 with an adhesive. The absorbent material 19 is the same as the water-absorbing material or the super-absorbent material used in the absorbent core 15, that is, it is adhered to the inner peripheral surface of the extending portion 18. It is similar to a thing. The adhesive is the same as the adhesive that bonds the absorbent core 15 and the cover sheet 16 together, and is most preferably a hot-melt adhesive. Thus, a pair of longitudinally extending portions 21 and 22 on the ventral side and the dorsal side were formed, and the absorbent material 19 was adhered to each of the longitudinally extending portions 21 and 22. The reason for this is that it absorbs perspiration from the abdomen and back of the wearer to prevent stuffiness in the disposable diaper 1, and at the same time, when the absorbent core 15 is pressed, the liquid exuded from the absorbent core 15 is removed. This is to prevent the liquid from leaking to the outside of the disposable diaper 1 from the abdominal sheet member 3 side or the dorsal sheet member 4 side. As a result, the pair of longitudinal side extensions 21 and 22 can stably keep the environment inside the disposable diaper 1 in a dry state together with the extension 18, and more reliably prevent liquid leakage. It is possible to prevent Here, of the pair of length direction side extension portions 21 and 22, the abdominal length direction side extension portion 21 has a basis weight of the absorbent material 19 adhered to the inner peripheral surface side of It is larger than the dorsal longitudinal side extensions 22 . This is because, for example, when a man wears the disposable diaper 1, excretions such as urine are often excreted on the front side, that is, on the abdomen side of the wearer. This is because it is preferable to increase the absorption capacity of the excrement as much as possible. In this embodiment, the ventral longitudinal extension 21 is bonded to the inner peripheral surface of the absorbent material 19 more than the dorsal longitudinal extension 22. Since the basis weight of the absorber 13 is increased, the absorbent body 13 has a higher ability to absorb excrement on the ventral side than on the dorsal side. As a result, the excreted liquid discharged to the abdomen can be quickly absorbed, and the environment inside the disposable diaper 1 can be more effectively and stably maintained in a dry state. The ventral sheet member 3 is formed in a substantially rectangular shape elongated in the direction along the width direction of the crotch sheet member 2, that is, in the lateral direction of the wearer when worn. The length in the length direction is formed larger than the length in the width direction of the crotch sheet member 2 . More specifically, the abdominal sheet member 3 includes an inner sheet 26 positioned on the wearer's skin side and an outer surface positioned on the side opposite to the wearer's skin, that is, on the outer side of the disposable diaper 1 . The side sheet 27 and the direction along the width direction of the crotch sheet member 2, which is arranged between the inner surface side sheet 26 and the outer surface side sheet 27, that is, the straight line in the length direction of the abdominal side sheet member 3 and a plurality of ventral elastic members 28 extending vertically. The inner surface side sheet 26 and the outer surface side sheet 27 of the ventral sheet member 3 are made of non-woven fabric or the like having excellent air permeability and are formed to have the same shape and size. The inner sheet 26 and the outer sheet 27 can be made of the same nonwoven fabric as the liquid-permeable sheet 11 of the crotch sheet member 2 . On the other hand, the plurality of ventral elastic members 28 elastically expand and contract in their axial direction, that is, in the length direction of the ventral sheet member 3 (the direction along the width direction of the crotch sheet member 2). In the embodiment, thread-like rubber is used. These ventral elastic members 28 are arranged at predetermined intervals in the width direction of the ventral sheet member 3, that is, in the vertical direction when worn (upright position), and the inner surface side sheet 26 and the outer surface side elastic members 28 are arranged side by side. It is housed between the seat 27 and the seat 27 . Adhesive is applied to the outer peripheral surface of each ventral elastic member 28, and each ventral elastic member 28 is joined to the inner surface side sheet 26 and the outer surface side sheet 27 with this adhesive. On the other hand, the dorsal sheet member 4, like the ventral sheet member 3, is a generally rectangular shape extending in a direction perpendicular to the length direction of the crotch sheet member 2, i.e., in the lateral direction of the wearer when worn. The length in the longitudinal direction of the back side sheet member 4 is formed to be larger than the length in the width direction of the crotch portion sheet member 2 . Specifically, the back sheet member 4 includes an inner sheet 31 located on the wearer's skin side and an outer surface side located on the side opposite to the wearer's skin surface, that is, on the outer side of the disposable diaper 1 . A sheet 32 ​​and a plurality of sheets extending in the direction along the width direction of the crotch sheet member 2, that is, in the length direction of the back side sheet member 4, disposed between the inner surface side sheet 31 and the outer surface side sheet 32. and a dorsal elastic member. The dorsal sheet member 4 and the ventral sheet member 3 are joined to each other at joints 5 at both longitudinal ends of the dorsal sheet member 4 and the ventral sheet member 3. It is designed to fit tightly around the waist or abdomen of the person. The inner surface side sheet 31 and the outer surface side sheet 32 ​​of the back sheet member 4 are made of non-woven fabric or the like having excellent air permeability and are formed to have the same shape and size. The inner sheet 31 and the outer sheet 32 ​​are made of the same nonwoven fabric as the liquid-permeable sheet 11 of the crotch sheet member 2 and the inner sheet 26 and the outer sheet 27 of the ventral sheet member 3. can be formed. The plurality of back side elastic members extend in the width direction of the crotch sheet member 2 and elastically expand and contract in the length direction. are used respectively. An adhesive is applied to the outer peripheral surface of each back side elastic member, and each back side elastic member is joined to the inner surface side sheet 31 and the outer surface side sheet 32 ​​with this adhesive. By the way, the length of the dorsal sheet member 4 in the width direction (vertical direction when worn (upright position)) is formed to be larger than the length of the ventral sheet member 3 in the width direction. It is designed to cover the wearer's waist and buttocks when worn. Specifically, the dorsal sheet member 4 includes a base portion 8 that is joined to the ventral sheet member 3 and covers the waist of the wearer, and a length of the crotch sheet member 2 that is longer than the base portion 8 . A buttocks covering portion 9 for covering the wearer's buttocks, which is disposed near the center of the direction, is integrally formed. The base portion 8 is formed in a substantially rectangular shape that is approximately the same size and shape as the abdominal side sheet member 3 , and a part of the plurality of back side elastic members extends along the length direction of the back side sheet member 4 . That is, it is arranged as a first elastic member 33 extending in the longitudinal direction of the base portion 8 . The first elastic members 33 are arranged in the width direction of the base portion 8 at predetermined intervals, that is, in the vertical direction when worn (upright position), and are arranged in the base portion 8 of the back sheet member 4. is accommodated between the inner surface side sheet 31 and the outer surface side sheet 32 ​​located in the range of . In this embodiment, the first elastic members 33 are provided at the same intervals as the abdominal elastic members 28 of the abdominal sheet member 3 in the same number. The buttocks covering portion 9 is an edge portion (hereinafter simply referred to as a buttocks covering) on ​​the center side of the length direction of the crotch sheet member 2 in the width direction of the back side sheet member 4 (vertical direction when worn (upright position)). (referred to as the edge portion of the portion (9)), that is, the lower end portion when worn (standing position), is the center side in the length direction of the crotch sheet member 2 (lower side when worn (standing position)). It is configured to protrude so as to be convex toward. In this embodiment, in the edge portion 9a of the buttock covering portion 9, the lengthwise central portion of the back sheet member 4, that is, the lengthwise central portion of the portion protruded to be convex The portion is a linear portion extending substantially linearly in the same direction as the longitudinal direction of the buttock covering portion 9 . In addition, the edge portion 9a of the buttock covering portion 9, other than the linear portion, is a gently curved portion. In the buttock covering portion 9 , among the plurality of back elastic members, the back elastic members other than the first elastic member 33 disposed on the base portion 8 are the crotch portion of the buttock covering portion 9 . A second elastic member 34 is arranged at the edge portion 9a on the central side of the sheet member 2 in the longitudinal direction. The second elastic member 34 extends in the length direction of the back side sheet member 4 along the edge portion 9a of the buttock covering portion 9 on the center side in the length direction of the crotch portion sheet member 2, and It is elastically stretchable in the axial direction. Further, the second elastic member 34 is arranged along the edge portion 9a of the buttock covering portion 9 as a whole, while the both end portions thereof extend in the longitudinal direction of the base portion 8. It is in a mode in which it enters into a part of the region on the side of the buttocks covering portion 9 on both end sides. In this embodiment, three second elastic members 34 are provided, and these second elastic members 34 are arranged at regular intervals in the width direction of the base portion 8, that is, in the longitudinal direction when worn. are accommodated between the inner surface side sheet 31 and the outer surface side sheet 32 ​​located in the range of the buttocks covering portion 9 in a state of being arranged side by side. Here, as shown in FIGS. 3 and 7, the first elastic member 33 and the second elastic member 34 are positioned at the ends of the back sheet member 4 in the longitudinal direction. A part of the ends in the axial direction is fixed to an inner surface side sheet 31 and an outer surface side sheet 32 ​​which form the back side sheet member 4 in a mutually intersecting state. In other words, both end portions of the second elastic member 34 are in a state in which the portion extending into the base portion intersects with a portion of the first elastic member 33 disposed on the base portion 8 . It's becoming In this way, the first elastic member 33 and the second elastic member 34 are arranged at the axial ends of the dorsal sheet member 4 at the longitudinal ends thereof. are intersecting with each other for the following reason. That is, even if the absorber 13 absorbs and retains the excreted liquid and the like and becomes heavy, the first elastic member 33 and the second elastic member 34 work together to keep the crotch sheet member upward. This is for pulling up and fitting the crotch sheet member 2 to the wearing part of the wearer. In this embodiment, the end portions of the two first elastic members 33, 33 positioned on the buttock covering portion 9 side (the lower side of the base portion 8 when worn (upright position)) in the base portion 8 , and portions of the end portions of the three second elastic members 34 are fixed to each other at the joint portion 5 so as to cross each other. The crossing of the first elastic member and the second elastic member at the joint means that the intersection of the first elastic member and the second elastic member is positioned at the joint. In addition, although the intersection of the first elastic member and the second elastic member is not located at the joint, the axial direction of each of the first elastic member and the second elastic member It also includes a state in which portions of the end portions reach the nearest joint portion while maintaining a state in which they intersect each other. Here, as shown in FIG. 3 , part of the ventral elastic member 28 extends along the ventral side of the pair of longitudinally extending portions 21 and 22 of the covering sheet 16 . It is arranged so as to overlap with a position corresponding to the exit portion 21 . A part of the back side elastic member is arranged so as to overlap with a position corresponding to the back side longitudinal side extension part 22 of the covering sheet 16 . In this embodiment, among the back side elastic members, some of the plurality of first elastic members 33 arranged on the base portion 8 of the back side sheet member 4 are the length of the back side. It is arranged so as to overlap with a position corresponding to the longitudinal side extending portion 22 . In this way, the ventral elastic member 28 and a part of the dorsal elastic member are arranged so as to overlap with the positions corresponding to the ventral longitudinally extending portion 21 and the dorsal longitudinally extending portion 22 . The reason for placing it in is as follows. That is, the abdominal longitudinally extending portion 21 and the dorsal longitudinally extending portion 22 are moved in the width direction of the absorber 13 by the elastic forces of the ventral elastic member 28 and the dorsal elastic member. By shrinking and gathering the absorbent material 19 adhered to the inner peripheral surfaces of the length direction side extensions 21 and 22 as much as possible, the length direction side extensions 21 , 22 as much as possible. The ventral lengthwise extending portion 21 and the dorsal lengthwise extending portion 22 contract in the width direction of the absorber 13 due to the elastic forces of the ventral elastic member 28 and the dorsal elastic member ( bending), and a plan view of the longitudinally extending portion 21 on the ventral side and the longitudinally extending portion 22 on the dorsal side (in this embodiment, when viewed from the liquid-permeable sheet side ), the density of the region where the absorbent material 19 is present is increased, so that the liquid absorption capacity of the pair of longitudinally extending portions 21 and 22 can be increased. At both ends in the length direction of the crotch sheet member 2, the liquid-impermeable sheet 12 and the ventral sheet member 3 or the dorsal sheet member 4 are overlapped and in contact with each other. are joined to each other. A known joining means can be used to join the liquid-impermeable sheet 12 at both ends in the length direction of the crotch sheet member 2 to the ventral sheet member 3 and the dorsal sheet member 4. Although they can, in this embodiment they are joined together by adhesive bonding. Specifically, in this embodiment, in the liquid-impermeable sheet 12 of the crotch sheet member 2, the liquid-impermeable sheet 12 abuts against the ventral sheet member 3 and the dorsal sheet member 4. The first adhesive portion 36 contacts the dorsal sheet member 4 at the portion, that is, both ends in the length direction of the liquid-impermeable sheet 12 , more specifically, the portion that contacts the ventral sheet member 3 . A first adhesive 37 is formed on each contacting portion. On the other hand, a second adhesive portion 38 is formed at a portion of the ventral sheet member 3 that abuts against one end of the liquid-impermeable sheet 12 in the longitudinal direction. A second adhesive portion 39 is formed at each portion that abuts on the other end portion side in the length direction of 12 . As shown in FIG. 7, the first adhesive portions 36 and 37 are arranged on the widthwise central side of the liquid-impermeable sheet 12 in the crotch sheet member 2, respectively. In addition, a first adhesive application region 40 is formed on the first adhesive portion 36 formed on the end portion side joined to the abdominal sheet member 3, and the end portion joined to the abdominal sheet member 3 is formed. A first adhesive application region 41 is provided on each of the first adhesive portions 37 formed on the side. In this embodiment, the first adhesive portions 36 and 37 are provided such that the first adhesive application areas 40 and 41 extend in the length direction of the crotch sheet member 2 . On the other hand, the second adhesive portions 38 and 39 are attached to the liquid-impermeable sheet 12 of the crotch sheet member 2 on the inner sheet 26 of the ventral sheet member 3 and the inner sheet 31 of the dorsal sheet member 4 . More specifically, it is provided at a position overlapping with the first adhesive portions 36 and 37 provided on the liquid-impermeable sheet 12 . In addition, the second adhesive portion 38 provided on the abdomen side sheet member 3 is continuously attached in the width direction of the crotch sheet member 2, that is, in the length direction of the abdomen side sheet member 3. An extending second adhesive application area 43 is provided. In addition, the second adhesive portion 39 provided on the back sheet member 4 extends continuously in the width direction of the crotch sheet member 2 , that is, in the length direction of the back sheet member 4 . A second adhesive application area 44 is provided. Any adhesive can be used as the adhesive applied to the first adhesive application areas 40, 41 and the second adhesive application areas 43, 44, but a hot-melt adhesive is most preferable. The crotch sheet member 2 (more specifically, the liquid-impermeable sheet 12) and the ventral sheet member 3, and the crotch sheet member 2 (more specifically, the liquid-impermeable sheet 12) and the back sheet The member 4 crosses the first adhesive application areas 40 and 41 in the first adhesive portions 36 and 37 and the second adhesive application areas 43 and 44 in the second adhesive portions 38 and 39. They are joined to each other in a state where they are aligned. Therefore, the adhesive applied to the first adhesive application areas 40 and 41 and the adhesive applied to the second adhesive application areas 43 and 44 are also crossed with each other, and the first adhesion is performed. The adhesive application areas 40 and 41 are in contact with the second adhesive sections 38 and 39, and the second adhesive application areas 43 and 44 are in contact with the first adhesive sections 36 and 37, respectively, and are joined to each other by the respective adhesives. The Rukoto. As a result, the crotch sheet member 2 is pulled up by the first adhesive application areas 40 and 41 continuous in the longitudinal direction of the crotch sheet member 2 and held so as not to hang down as much as possible. , in the second adhesive application regions 43, 44 intersecting the first adhesive application regions 40, 41, the downward tensile force acting on the first adhesive application regions 40, 41 is applied to the crotch region. It becomes possible to disperse them in the width direction of the sheet member 2 . As a result, the first adhesive application areas 40, 41 and the second adhesive application areas 43, 44 cooperate with each other even if the absorber becomes heavy due to the absorption and retention of the wearer's excrement. Therefore, it is possible to prevent the crotch sheet member 2 from sagging down and stably maintain the pulled up state. A manufacturing method for manufacturing a disposable diaper having the above configuration will be described below with reference to FIGS. 8 to 10. FIG. As a basic flow of the method for manufacturing the disposable diaper, a step S1 of forming a laminate for the crotch sheet member is performed, and a composite member for the abdominal sheet member and a composite member for the back sheet member are formed. Step S2 of forming is performed. After that, a step S3 of forming a crotch sheet member and a first adhesive part from the laminate for the crotch sheet member, and forming a second composite member on the composite member for the ventral sheet member and the composite member for the back sheet member. A step S4 of forming an adhesive portion and a step S5 of joining these crotch portion sheet members to the composite member for the abdominal side sheet member and the composite member for the back side sheet member are performed. Further, step S6 is performed to cut the composite member for the back sheet member in accordance with the predetermined shape of the buttocks covering portion of the back sheet member 4 of the disposable diaper 1 (cut along the legs). After that, as a finishing step, a step S7 of overlapping the composite member for the ventral sheet member and the composite member for the dorsal sheet member, and bonding the composite member for the ventral sheet member and the composite member for the dorsal sheet member to each other. , the cutting step S8 is performed. The step S1 of forming the laminate for the crotch sheet member will be described. That is, this step S1 includes a step of forming a continuous body of the absorber, a liquid-permeable sheet, a liquid-impermeable sheet, the absorber, and a pair of leak-proof walls that constitute the crotch sheet member 2, respectively. A stacking step of stacking is performed. In the step of forming the continuous body of absorbent bodies, a continuous body 67 of absorbent bodies is formed using an apparatus 60 as shown in FIG. Note that the continuous body 67 of absorbent bodies formed in this step is a plurality of absorbent cores 5 in a state in which a long nonwoven fabric 61 for a covering sheet, which serves as a covering sheet for the absorbent bodies, is wrapped around the plurality of absorbent bodies. , that is, a long one before being cut into a single absorbent body 13 . The device 60 applies an adhesive to a nonwoven fabric roll 62 around which the long nonwoven fabric 61 for the covering sheet is wound, and to the nonwoven fabric 61 for the covering sheet pulled out from the nonwoven fabric roll 62 onto a conveying line. A device 63 and a suction drum 64 for molding the absorbent core 15 and placing the molded absorbent core 15 on the nonwoven fabric 61 for the covering sheet are provided. Further, a folding device (sailor) 65 for folding the nonwoven fabric 61 for the covering sheet on which the absorbent core 15 is placed, and the nonwoven fabric 61 for the covering sheet folded by the folding device 65 and the absorbent core 15 are folded into the absorbent core 15 . and a pressing device 66 that presses the core 15 in the thickness direction. The continuous body 67 of the absorber is formed by pulling out the nonwoven fabric 61 for the covering sheet from the nonwoven fabric roll 62 onto the transfer line, and applying the coating device 63 to the upper surface of the nonwoven fabric 61 for the covering sheet on the transfer line. A coating step of coating the adhesive is performed by Further, a mounting step of mounting the absorbent core 15 by the suction drum 64 on the nonwoven fabric 61 for the covering sheet, the upper surface of which is coated with an adhesive in the coating step, and the absorbent core 15 is mounted after the mounting step. and a folding step of folding the nonwoven fabric 61 for the cover sheet by the folding device 65 . After that, the nonwoven fabric 61 for the cover sheet and the absorbent core 15 folded in the folding step are pressed in the thickness direction of the absorbent core 15 by the pressing device 66, thereby forming a continuous absorbent body 67. , the absorbent body continuum 67 is conveyed to the lamination step, which is the next step. In the coating step, as shown in FIG. 9A, the coating device 63 spreads the hot liquid over the entire width (length in the horizontal direction perpendicular to the transport direction) of the nonwoven fabric 61 for the cover sheet on the transport line. The adhesive, such as a melt adhesive, is applied. In this embodiment, the adhesive is continuously applied to the upper surface of the nonwoven fabric 61 for the cover sheet along the conveying direction of the nonwoven fabric 61 for the cover sheet. The applicator 63 may have any configuration as long as it can apply the adhesive over the entire width of the nonwoven fabric 61 for the covering sheet. For example, a plurality of nozzles capable of ejecting an adhesive with a predetermined width are arranged in the width direction of the nonwoven fabric 61 for the covering sheet, and these nozzles cover the entire width of the nonwoven fabric 61 for the covering sheet. It is possible to use a configuration in which an adhesive is applied to the . In the mounting step, while the suction drum 64 is rotating, the water-absorbent material and the high-absorbency material constituting the absorbent core 15 are provided on the outer peripheral surface of the suction drum 64 on the upper side of the suction drum 64. In addition, the absorbent core 15 is formed in the concave mold 64a having a predetermined shape by suction and lamination. As the suction drum 64 rotates, the absorbent core 15 in the mold 64a moves downward of the suction drum 64. By stopping the suction of the absorbent core 15 by the 64, the absorbent core 15 in the mold 64a is separated from the mold 64a and transferred onto the nonwoven fabric 61 for the covering sheet and placed thereon. A known suction drum 64 can be used as long as the suction drum 64 has a mold that fits the desired shape of the absorbent core on its outer peripheral surface. The arrow marked on the suction drum 64 in FIG. 8 indicates the suction direction. Here, as shown in FIG. 9(b), when the absorbent core 15 is placed on the upper surface of the nonwoven fabric 61 for the cover sheet, the water absorption that constitutes the absorbent core 15 is caused by the impact or the like at the time of placing. A part of the elastic material or the superabsorbent material separates from the absorbent core 15 and falls onto the nonwoven fabric 61 for the covering sheet. Then, the fallen water absorbent material and super absorbent material are adhered to the nonwoven fabric 61 for the covering sheet by the adhesive on the upper surface of the nonwoven fabric 61 for the covering sheet. These dropped water-absorbent materials and super-absorbent materials become part of the absorbent material 19 of the extensions 18 and 18 and the lengthwise extensions 21 and 22 . At this time, the water-absorbent material and superabsorbent material that have fallen onto the nonwoven fabric 61 for the cover sheet are basically distributed over the entire width of the nonwoven fabric 61 for the cover sheet and at both ends of the absorbent core 15 in the length direction. It spreads out over a range. However, the closer to the absorbent core 15, the greater the basis weight of the water-absorbent material and the superabsorbent material, and the farther away from the absorbent core 15, the smaller the basis weight. Further, with respect to the extending portions 18 , 18 , the water-absorbing material or the highly absorbent material is likely to come off from the surfaces on both sides in the width direction of the absorbent core 14 . In addition, the surfaces on both sides in the width direction of the absorbent core 14 have a larger area than the surfaces on both sides in the length direction of the absorbent core 14, and the basis weight from which the water-absorbing material or the highly absorbent material falls off is relatively large. Therefore, the basis weight of the absorbent material 19 adhered to the inner peripheral surface tends to be larger than that of the lengthwise extending portions 21 and 22 . On the other hand, in this placing step, as described above, the absorption core 15 in the mold 64a is moved to the lower side of the suction drum 64 by rotating the suction drum 64. Also when the suction drum 64 rotates, part of the water-absorbent material and high-absorbency material constituting the absorbent core 15 falls off from the mold 64 a of the suction drum 64 . At that time, the dropped water-absorbent material and superabsorbent material fall on the upper surface of the nonwoven fabric 61 for the covering sheet, and adhere to the nonwoven fabric 61 for the covering sheet by the adhesive on the upper surface of the nonwoven fabric 61 for the covering sheet. Glued. These dropped water-absorbent materials and super-absorbent materials also become part of the absorbent material 19 of the extensions 18 and 18 and the lengthwise extensions 21 and 22 . At this time, as the suction drum 64 rotates, the water-absorbent material and high-absorbency material falling out of the absorbent core 15 in the mold 64a of the suction drum 64 move away from the mold 64a as the suction drum 64 rotates. It mainly falls from a position inclined by about 90 degrees to a position facing the upper surface of the nonwoven fabric 61 for the covering sheet. Therefore, on the upper surface of the nonwoven fabric 61 for the covering sheet on the transport line, there are many chances that the water absorbent material or the super absorbent material will fall on the downstream side in the transport direction from the position where the absorbent core 15 is placed. Since (the time during which the absorbent core 15 can be dropped is long), a large amount of the water-absorbent material and the superabsorbent material drop downstream in the conveying direction from the position where the absorbent core 15 is placed. Conversely, on the upstream side in the conveying direction of the position where the absorbent core 15 is placed, there is less chance that the water-absorbent material or superabsorbent material will drop (the time period during which the material can drop is shorter) than on the downstream side. Therefore, the basis weight of the falling water-absorbent material and super-absorbent material is smaller than that on the downstream side. As a result, on the upper surface of the nonwoven fabric 61 for the covering sheet, a state is formed in which the basis weight of the absorbent material is large on one side in the length direction of the absorbent core 15 and small on the other side. Therefore, in the post-process step S3 of forming the crotch sheet member 2 and the first adhesive portions 36 and 37 from the later-described crotch sheet member laminate 45, the crotch sheet member laminate 45 is formed. When the cover sheet 16 is cut into one crotch part sheet member 2 to form a pair of longitudinally extending parts, the absorbent material adhered to the cover sheet 16 has a higher basis weight. Let the length direction side extension part be the length direction side extension part 21 of the ventral side located in the ventral sheet member side. Conversely, the length direction side extension portion having the smaller basis weight of the absorbent material 19 is designated as the back side length direction side extension portion 22 located on the side of the back side sheet member. As a result, the covering sheet 16 of the absorbent body 13 is such that, of the pair of longitudinally extending portions, the ventral longitudinally extending portion 21 is made of the absorbent material 19 adhered to the inner peripheral surface side. It is possible to have a configuration in which the basis weight is greater than that of the length direction side extending portion 22 on the dorsal side. In the folding step, the nonwoven fabric 61 for the cover sheet on which the absorbent core 15 is placed is folded around the outer peripheral surface of the absorbent core 15 by the folding device 65 having various known configurations. Fold it so that it is wrapped around the forehead. Specifically, as shown in FIG. 9(c), the nonwoven fabric 61 for the covering sheet is extended in the longitudinal direction of the absorbent core 15 at each corner 15a of the maximum width portion W of the absorbent core 15. Fold along a straight line. At this time, the widthwise end portions of the nonwoven fabric 61 for the covering sheet are overlapped at the widthwise central portion of the absorbent core 15 on the upper surface side of the absorbent core 15, and the adhesive applied in the application step is applied. Glue and connect to each other. As a result, a portion corresponding to the overlapping portion 20 of the covering sheet 16 is formed. Here, since the upper surface of the nonwoven fabric 61 for the covering sheet is in a state in which the water-absorbing material or the high-absorbent material is adhered over the entire width in the placing step, the nonwoven fabric 61 for the covering sheet , the absorbent material 19 is arranged between one end and the other end in the width direction of the nonwoven fabric 61 for the covering sheet. On the other hand, the absorbent core 15 is formed at both ends in the width direction with leg recesses 17, 17 that are curved so as to be convex toward the center side in the width direction of the absorbent core 15, respectively. Therefore, as shown in FIG. 9(d), the nonwoven fabric 61 for the cover sheet is formed with extending portions 18, 18 at the leg hole portions 17, 17. As shown in FIG. That is, the nonwoven fabric 61 for the cover sheet extends from the widthwise end of the absorbent core 15 to the leg holes 17, 17 in the state of being wound around the absorbent core 15, and extends from the inner peripheral surface of the absorbent core 15. The extending portions 18 and 18 are formed so that the sides thereof are not in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core 15 . At this time, the absorbent material 19, which is a water-absorbing material or a highly absorbent material that has fallen off from the absorbent core 15, is adhered to the inner peripheral surfaces of the extending portions 18,18. The water-absorbent material and super-absorbent material in the absorbent core 15 may fall off even during the folding process, and even if the water-absorbent material and super-absorbent material have already fallen off, Some are not completely adhered to the nonwoven fabric 61 for the purpose. Then, such a water-absorbing material or superabsorbent material that has not yet been adhered to the nonwoven fabric 61 for the covering sheet is located below the absorbent core 15 in the nonwoven fabric 61 for the covering sheet (liquid-impermeable sheet side). Since it tends to move to the bent portion of the tape, it is easily adhered to that portion. Therefore, compared to other portions on the inner peripheral surface side of the extending portions 18, 18, the bent portion on the lower side of the absorbent core 15 has a larger basis weight of the absorbent material and a higher absorption capacity. The folded portion on the lower side of the absorbent core 15 on the inner peripheral surface side of the extending portions 18, 18 is the base of the leg on the inner thigh side of the wearer, which tends to sweat relatively easily when the disposable diaper 1 is worn. Since the absorbent material 19 adhered to the bent portion on the lower side of the absorbent core 15 effectively absorbs sweat, the environment inside the diaper 1 can be kept in a more stable and dry state. becomes. In the pressing step, the non-woven fabric 61 for the covering sheet is wrapped around the axis of the absorbent core 15 in the folding step, and the non-woven fabric 61 is wrapped around the axis of the absorbent core 15 by the pressing device 66 . Press in the thickness direction. As a result, the shape of the absorbent core 15 can be stabilized, the nonwoven fabric 61 for the covering sheet and the absorbent core 15 can be adhered to each other, and the widthwise end portions of the nonwoven fabric 61 for the covering sheet overlap. Mutual adhesion is performed more reliably. As the pressing device 66, any configuration can be used. For example, a plurality of pairs of upper and lower pressing rolls are provided. 15 can be used. In addition, in the process of forming the continuous body 67 of these series of absorbent bodies, part of the water absorbent material and the super absorbent material is removed from the absorbent core 15 not only in the placing process and the bending process but also in the pressing process. It may fall out. In addition, most of the dropped water-absorbent material and super-absorbent material are adhered to the nonwoven fabric 61 for the covering sheet, but some of them are not completely adhered to the nonwoven fabric 61 for the covering sheet and remain movable. Even such a material can function as an absorbent material and can absorb and retain liquids such as excrement and sweat when in contact with it. Then, after the step of forming the continuous body 67 of the absorbent body, the lamination step is performed. In the lamination step, a liquid-permeable sheet, a liquid-impermeable sheet, a continuous body 67 of the absorbent body, and a pair of leak-proof walls are laminated to form a long crotch sheet member laminate 45 that is long in the conveying direction. (However, the liquid-permeable sheet, the liquid-impermeable sheet, and the pair of leak-proof walls are elongated and formed long in the conveying direction). After that, as shown in FIG. 10, the laminate 45 for the crotch sheet member is conveyed toward the next step S3 for forming the crotch sheet member 2 and the first adhesive portions 36 and 37 . Note that the crotch sheet member laminate 45 is in a state before the individual crotch sheet members 2 are formed, in which a plurality of crotch sheet members 2 are substantially connected in the longitudinal direction. Individual crotch sheet members 2 are obtained by being cut into predetermined lengths in the process. Next, the step S2 of forming composite members for the ventral sheet member and the dorsal sheet member will be described. In this step S2, as shown in FIG. 10, the long nonwoven fabric 46 for the outer surface side sheet forming the outer surface side sheets 27 and 32 of the abdominal sheet member 3 and the back sheet member 4 is conveyed. On the nonwoven fabric 46 for the outer surface side sheet, a plurality of lengths in a state in which the nonwoven fabric 46 for the outer surface side sheet extends in the length direction and is stretched by a predetermined ratio from the natural length in the length direction (axial direction) is stretched. Elastic members 47 to 49 of length are arranged at predetermined intervals. The composite member 50 for the abdominal sheet member is the abdominal sheet member 3 in the disposable diaper 1 as a finished product, and the composite member 51 for the back sheet member is the back sheet member of the disposable diaper 1. 4 respectively. Then, the abdominal sheet member 3 is placed on the outer sheet nonwoven fabric 46 on which the long abdominal sheet member elastic member 47 and the long abdominal sheet member elastic members 48 and 49 are arranged. A long composite member 53 extending in the conveying direction is formed by laminating long nonwoven fabrics 52 for the inner sheet, which form the inner sheets 26 and 31 of the back sheet member 4, respectively. The composite member 53 is formed by integrating the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member. Here, regarding the back sheet member elastic members 48 and 49, the first back sheet member elastic members 48 and 49 are arranged at a position corresponding to the base portion 8 of the back sheet member 4 of the disposable diaper 1. The elastic member 48 and the second back sheet member elastic member 49 arranged at a position corresponding to the buttocks covering portion 9 differ in the arrangement method for the nonwoven fabric 46 for the outer surface side sheet. That is, the first elastic member 48 for the dorsal side sheet member includes the plurality of elongated elastic members 47 for the abdominal side sheet member disposed at positions corresponding to the composite members 50 for the abdominal side sheet member. They are arranged substantially linearly on the nonwoven fabric 46 for the outer surface side sheet at substantially the same intervals. On the other hand, the second back-side sheet member elastic member 49 has a predetermined shape of the edge portion 9a of the buttock covering portion 9, that is, a convex shape toward the center side in the length direction of the crotch portion sheet member. It is arranged on the nonwoven fabric 46 for the outer surface side sheet while curving it according to the protruded shape so as to form a shape. The first elastic member 48 for the back sheet member becomes the first elastic member 33 of the back elastic members provided in the back sheet member 4 in the disposable diaper 1 as a finished product. The second back sheet member elastic member 49 serves as the second elastic member 34 of the back side elastic members provided in the back sheet member 4 of the disposable diaper 1 . Then, while conveying the long composite member 53 in the length direction, the composite member 53 is cut at a predetermined position in the width direction of the composite member 53 by a cutter 55 and divided into two. A composite member 50 for the elongated abdominal sheet member and a composite member 51 for the elongated dorsal sheet member, which are in a state before being divided into individual abdominal sheet members 3 and dorsal sheet members 4. respectively. The composite member 50 for the abdominal sheet member and the composite member 51 for the dorsal sheet member at this stage are formed by the abdominal sheet member 3 and the dorsal sheet member 4 of the disposable diaper 1 as a finished product. It is in a state in which a plurality of sheets are connected, and will be divided into individual ventral sheet members 3 and dorsal sheet members 4 in a subsequent process. In addition, the conveying direction MD of the composite member 50 for the abdominal sheet member and the composite member 51 for the back sheet member are the longitudinal directions of the abdominal sheet member 3 and the back sheet member 4, respectively. After that, the composite member 50 for the abdominal side sheet member and the composite member 51 for the dorsal side sheet member are maintained in a state of being arranged side by side with a constant space therebetween, and the second adhesive portion, which is the next step, is applied. It conveys toward process S4 of forming. After the step S1 of forming the laminate for the crotch portion sheet member, the step S3 of forming the crotch portion sheet member 2 and the first adhesive portions 36 and 37 from the laminate 45 for the crotch portion sheet member is carried out. . In this step S3, as shown in FIG. 10, various adhesives such as hot-melt adhesives are applied to the liquid-impermeable sheets in the transported crotch sheet member laminate 45 by an adhesive coating device 56. The first bonding portions 36 and 37 are formed by coating. When forming the first adhesive portions 36 and 37, the predetermined length in the longitudinal direction of the crotch sheet member 2 is taken into account with respect to the laminate 45 for the crotch sheet member. Adhesive is applied to portions of the crotch sheet member 2 corresponding to both end portions of the liquid-impermeable sheet 12, which are in contact with the ventral sheet member 3 and the dorsal sheet member 4 in an overlapping state. . When applying the adhesive, the liquid impermeable sheet 12 of the crotch part sheet member 2 is provided with first adhesive application areas 40 and 41 which are continuous in the longitudinal direction. In this embodiment, the laminate 45 for the crotch sheet member is conveyed with the liquid-impermeable sheet side positioned on the upper surface for manufacturing reasons. It is applied from above the laminate 45 for the crotch sheet member. Further, the crotch sheet member laminate 45 is later cut into individual crotch sheet members 2, but in this embodiment, when the adhesive 41 is applied, the adhesive 41 is applied with respect to the conveying direction MD. The position of the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the tip side of the portion corresponding to the subsequent crotch sheet member 2 adjacent to the portion corresponding to the preceding crotch sheet member 2 The adhesive is simultaneously applied to the positions to form the first adhesive portions 36 and 37 of the crotch sheet members 2 and 2 . Specifically, when applying the adhesive to the crotch sheet member laminate 45, the adhesive 41 is applied at regular intervals in consideration of the predetermined length of the crotch sheet member 2 in the longitudinal direction. By applying the adhesive, the first adhesive application area 41 covers both the tail end side of the portion corresponding to the preceding crotch sheet member 2 and the tip side position of the portion corresponding to the adjacent succeeding crotch sheet member 2 . , 40 are provided, and the first adhesive portions 37, 36 (in the case of FIG. A first bonding portion 36) is simultaneously formed on the tip end side of the portion corresponding to . In this embodiment, when forming the first adhesive portions 36 and 37, the first adhesive application regions 40 and 41 are aligned in the width direction of the crotch sheet member laminate 45. In this state, a plurality of crotch sheet member laminates 45 are formed in the length direction of the portion corresponding to the crotch sheet member 2 . Then, after forming the first adhesive portions 36 and 37, the laminate 45 for the crotch sheet member is sequentially cut into predetermined lengths so that one absorbent core 15 is included. Individual crotch sheet members 2 are formed sequentially. At this time, the first adhesive portions 36 and 37 are formed on both end portions of the crotch sheet member 2, respectively. When cutting the laminate 45 for the crotch part sheet member, the nonwoven fabric 61 for the covering sheet, which is wrapped around the outer peripheral surface of the absorbent core 15, is cut from both ends of the absorbent core 15 in the length direction. The absorbent core 15 is cut at a fixed length in the longitudinal direction. As a result, the pair of longitudinally extending portions 21 and 22 are formed on the cover sheet 16 . Here, on the inner peripheral surface side of these length direction side extending portions 21 and 22, the water absorbent material and the high absorbent material dropped from the absorbent core 15 in the step S1 of forming the laminate for the crotch sheet member. The absorbent material 19, which is an absorbent material, is already in a state of being adhered with an adhesive. In this embodiment, the nonwoven fabric 61 for the covering sheet is cut so as to have substantially the same length as the lengthwise direction of the crotch sheet member 2, and the pair of nonwoven fabrics extending in the lengthwise direction is cut. Of the portions, the one to which a greater amount of the absorbent material is adhered on the inner peripheral surface side serves as the lengthwise extending portion 21 on the ventral side, and the other serves as the lengthwise extending portion 22 on the dorsal side. On the other hand, after the step S2 of forming the composite members 50 and 51 for the ventral sheet member and the dorsal sheet member, the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member are formed. Step S4 of forming the second bonding portions 38 and 39 is performed. In this step S4, as shown in FIG. 10, the upper surface side of the conveyed abdominal sheet member composite member 50 and the back sheet member composite member 51, that is, the inner sheet nonwoven fabric 52 is subjected to , the second adhesive portions 38 and 39 are formed by applying various adhesives such as hot-melt adhesives by the adhesive applicators 57 and 58 . When forming the second adhesive portions 38 and 39, separate ventral sheet member 3 and dorsal sheet member are attached to composite member 50 for ventral sheet member and composite member 51 for dorsal sheet member. 4, the adhesive is applied to the position corresponding to the portion that abuts on the crotch sheet member 2 while being overlapped. At this time, when applying the adhesive, the second adhesive that is continuous in the longitudinal direction (ie, the conveying direction) of the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member Application areas 43 and 44 are provided, respectively. Further, after the step S4 is finished, the step S5 of joining the crotch sheet member, the composite member for the abdominal side sheet member, and the composite member for the dorsal side sheet member is carried out. In this step S5, as shown in FIG. 10, the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member on which the second adhesive portions 38 and 39 are respectively formed are subjected to the Both ends of the liquid impermeable sheet 12 in the crotch sheet member 2 on which the first adhesive portions 36 and 37 are formed are brought into contact with each other, and the first adhesive portions 36 and 37 and the second adhesive portions are bonded together. 38 and 39 are brought into close contact with each other. As a result, the first adhesive application areas 40, 41 of the first adhesive portions 36, 37 and the second adhesive application areas 43, 44 of the second adhesive portions 38, 39 intersect. Then, the liquid-impermeable sheet 12 of the crotch sheet member 2, the composite member 50 for the ventral sheet member, and the composite member 51 for the dorsal sheet member are respectively joined. At this time, the composite member 50 for the abdominal side sheet member and the composite member 51 for the back side sheet member are conveyed in a state in which a constant distance is maintained, and the crotch portion sheet member 2 has a length of The direction is along the sheet surface of the composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member and is arranged so as to be substantially perpendicular to the length direction of these composite members 50 and 51 . set up. As a result, the first adhesive application areas 40, 41 and the second adhesive application areas 43, 44 are brought into close contact with each other in an intersecting state, and the adhesive of these first adhesive application areas 40, 41 The adhesives of the second adhesive application areas 43 and 44 are integrated and joined to each other. In this embodiment, the crotch sheet member 2 is conveyed with the liquid-impermeable sheet 12 formed with the first adhesive portions 36 and 37 positioned on the upper surface side. The crotch sheet member 2 needs to be turned upside down and brought into contact with the composite member 50 for the ventral side sheet member and the composite member 51 for the dorsal side sheet member. After completion of step S5, step S6 is performed to cut the composite member for the back sheet member in accordance with the predetermined shape of the buttocks covering portion. In this step S6, as shown in FIG. 10, the shape of a predetermined edge portion 9a of the buttock covering portion 9 of the disposable diaper 1 as a product, that is, the center side of the crotch portion sheet member 2 in the length direction. A portion corresponding to the edge portion 9a of the buttocks covering portion 9 in the composite member 51 for the back sheet member is cut (leg cut) so as to conform to the convex shape. Note that the cutting in step S6 is performed along the second elastic member 49 for the back sheet member provided in step S1. Thereafter, in the step S7 of overlapping the composite member for the ventral sheet member and the composite member for the dorsal sheet member, as shown in FIG. The composite member 50 for the ventral sheet member and the composite member 51 for the dorsal sheet member, which are joined to the member 2, are superimposed on each other. Then, after the step S7 is finished, a step S8 is carried out for mutually adhering and cutting the composite member for the ventral sheet member and the composite member for the dorsal sheet member. In this step S8, as shown in FIG. 10, the composite member 50 for the abdominal sheet member and the composite member 51 for the back sheet member which are superimposed are combined into the predetermined abdominal sheet member 3 and the back sheet member. 4 are joined at a constant width by any means such as fusion bonding by heat sealing or ultrasonic sealing while leaving a constant interval so as to match the length in the longitudinal direction. As a result, the longitudinal ends of the abdominal sheet member 3 and the dorsal sheet member 4 are joined together. A part of the joined portion becomes the joint portion 5 of each disposable diaper 1 as a finished product. At this time, part of the crossing portion of the first back sheet member elastic member 48 and the second back side sheet member elastic member 49 is a joint between the abdominal side sheet member 3 and the back side sheet member 4. It is preferably located in and near the part. After that, the portion where the composite member 50 for the abdominal side sheet member and the composite member 51 for the back side sheet member are joined is cut into individual disposable diapers 1 to form the joined portions 5, 5. By forming, the pants-type disposable diaper 1 is completed. As described above, according to the disposable diaper 1 having the configuration described above, the covering sheet 16 wound around the axis in the length direction of the absorbent core 15 is wrapped around the outer peripheral surface of the absorbent core 15 so as to cover the width of the absorbent core 15 . The absorbent core 15 has extending portions 18, 18 which extend from the ends of the direction and whose inner peripheral surface side is not in contact with the surface of the absorbent core 15 on the side of the liquid permeable sheet and the surface on the side of the liquid impermeable sheet. doing. Therefore, when the absorbent core 15 expands due to the absorption of liquid such as excreted liquid, the extensions 18 and 18 serve as expansion allowances for the absorbent core 15, so that expansion of the absorbent core 15 is not inhibited. As a result, the absorbent core 15 can fully exhibit its original absorbent power. In addition, an absorbent material 19 is adhered to the inner peripheral surfaces of the extending portions 18 , 18 . Therefore, even if the liquid once absorbed from the absorbent core 15 oozes out to these extending portions 18, 18, the absorbent material absorbs the liquid again, while the sweat of the wearer of the disposable diaper 1 is absorbed. Even if it adheres to the extending portions 18 , 18 , the absorbent material 19 absorbs it. As a result, it is possible to stably prevent leakage of liquid such as excretion liquid from the disposable diaper 1 and stuffiness during wearing. As a result, the disposable diaper 1 can ensure both stable absorbency when worn and good usability due to prevention of liquid leakage and stuffiness. In the above-described embodiment, the absorbent core 15 has leg holes 17, 17 on both ends in the width direction, which are curved so as to be convex toward the center in the width direction of the absorbent core 15, respectively. The cover sheet 16 is wound around the absorbent core 15 while extending outward in the width direction of the absorbent body 13 from the leg holes 17, 17. The extension portions 18, 18 are the portions extending from the portion. However, the absorbent core does not necessarily have leg holes. Thus, even if there is no leg hole portion, the covering sheet extends from the widthwise end of the absorbent core, and the inner peripheral surface side is the surface of the absorbent core on the side of the liquid-permeable sheet. It suffices if it has an extending portion that is not in contact with the liquid-impermeable sheet side surface. In the above embodiment, a disposable diaper 1 as an absorbent article is provided with a pair of disposable diapers extending in the length direction of the absorbent body, which can be raised on the side of the liquid-permeable sheet opposite to the absorbent body. Although it is provided with a leak-proof wall, it is not always necessary to provide these leak-proof walls. Moreover, even when the pair of leak-proof walls are provided, the pair of leak-proof walls are most likely to be located at the leg hole portion of the absorbent body (absorbent core 15) as in the above-described embodiment. It is not necessary that the position corresponding to the central portion in the width direction of the absorbent body can be freely raised as the base end portion. can be set arbitrarily. In the above embodiment, the absorbent material 19 is adhered to the entire inner peripheral surfaces of the extensions 18 , 18 . However, the absorbent material does not necessarily have to be adhered to the entire inner peripheral surface of the extending portion, and a part of the inner peripheral surface of the extending portion, for example, the liquid-impermeable sheet side of the absorbent core. The absorbent material may be adhered only to the position or only to the position on the side of the liquid permeable sheet. Further, even when the absorbent material is adhered to the entire inner peripheral surface of the extension, the absorbent material is adhered substantially evenly to the entire inner peripheral surface of the extension. Alternatively, it may be adhered in a biased state to a part of the inner peripheral surface of the extension. In the above-described embodiment, the covering sheet 16 is wound around the absorbent core 15 in a forehead shape. As long as it is wound around the longitudinal axis of the absorbent core and the extending portion is formed, it can be wound in any manner. Furthermore, even when the covering sheet is wound around the absorbent core in a forehead shape, it is not necessary to bend the corners of the maximum width portion of the absorbent core as in the above-described embodiment. It may be bent along a straight line extending in the longitudinal direction of the absorbent core at any position where the part is formed. Further, in the above-described embodiment, the extending portions 18, 18 are formed with a space on the inner peripheral surface side, and are deformed as the pair of leak-proof walls 14, 14 rise. It is a thing. However, the extending portion extends from the end portion in the width direction of the absorbent core, and the inner peripheral surface side thereof is in contact with the liquid-permeable sheet-side surface and the liquid-impermeable sheet-side surface of the absorbent core. If it is non-contact, for example, as shown in FIG. 11, the space on the inner peripheral surface side of the extending portion 18' is crushed in the normal state, and the inner peripheral surfaces of the extending portion 18' are adhered to each other. There may be. The structure of the absorber in FIG. 11 is basically the same as that of the above-described embodiment except for the shape of the extending portion. Therefore, detailed description is omitted. In the above-described embodiment, the cover sheet 16 has overlapping portions 20 which are connected to each other by an adhesive in a state in which both end portions in the winding direction of the absorbent core 15 are overlapped. The portion 20 is fixed to the liquid-permeable sheet side of the absorbent core, but this overlapping portion may be arranged on the liquid-impermeable sheet side. In the above-described embodiment, the absorbent material 19 is arranged between one end side and the other end side of the covering sheet 16 forming the overlapping portion 20 in the direction in which it is wound around the absorbent core 15 . However, it is not always necessary to arrange the absorbent material between the one end side and the other end side of the cover sheet 16 in the direction of winding around the absorbent core 15 in the overlapping portion. In the above-described embodiment, the covering sheet 16 has a pair of longitudinally extending portions 21 and 22 extending from both ends of the absorbent core 15 in the lengthwise direction. An absorbent material 19 having liquid absorption properties is adhered to the inner peripheral surfaces of the direction-side extending portions 21 and 22 with an adhesive. However, the covering sheet does not necessarily have to have a pair of lengthwise extensions, or the lengthwise extension may be provided only at one end in the lengthwise direction of the absorbent core. may Further, even if the covering sheet has lengthwise extensions on one or both lengthwise ends of the absorbent core, the inner periphery of the lengthwise extensions is provided. The absorbent material may not adhere to the face side. In the above embodiment, part of the ventral elastic member 28 and part of the dorsal elastic member (in this case, part of the first elastic member 33) of the length direction side extensions 21 and 22 so as to overlap with positions corresponding to the length direction side extensions 21 and 22 which are closest thereto. However, the ventral elastic member and the dorsal elastic member have at least one of a portion of the ventral elastic member and a portion of the dorsal elastic member that is the length of the pair of covering sheets. It suffices if it is arranged so as to overlap a position corresponding to the most recent longitudinal side extending portion among the longitudinal side extending portions. Alternatively, both the ventral elastic member and the dorsal elastic member may not overlap at positions corresponding to the most recent longitudinal side extensions. In the above-described embodiment, of the pair of length direction side extensions 21 and 22, the direction side extension 21 located on the side of the ventral sheet member 3 has the inner peripheral surface The basis weight of the absorbent material 19 adhered to the side is greater than the dorsal longitudinal side extensions 22 located on the side of the dorsal sheet member. However, the basis weight of the absorbent material adhered to each of the inner peripheral surfaces of the pair of longitudinal side extending portions can be set arbitrarily. There may be more dorsal longitudinal extensions than ventral longitudinal extensions. In the above embodiment, the first adhesive portions 36 and 37 are provided on both ends in the length direction of the crotch sheet member 2, and the second adhesive portions 38 and 39 are provided on the ventral side. They are provided on the sheet member 3 and the dorsal sheet member 4, respectively. However, regarding the arrangement positions of the first adhesive portion and the second adhesive portion, when the crotch sheet member, the abdominal side sheet member and the back side sheet member are adhered, the first adhesive portion and the second adhesive portion can be arbitrarily set to the crotch sheet member, the ventral sheet member, and the dorsal sheet member, as long as they are adhered to each other. That is, a first adhesive portion is provided on one side of the crotch portion sheet member or the abdominal side sheet member, and a second adhesive portion is provided on the other side, while either the crotch portion sheet member or the back side sheet member is provided. A first bond may be provided on one side and a second bond may be provided on the other side. Alternatively, the crotch sheet member, the ventral sheet member, and the dorsal sheet member are bonded by any method without using the first bonding portion and the second bonding portion as in the above embodiment. Alternatively, they may be bonded by a bonding method that partially uses the first bonding portion and the second bonding portion. As described above, the crotch sheet member, the ventral sheet member, and the back sheet member can be joined by a known joining means other than adhesion using an adhesive. In the above embodiment, an example of a disposable diaper is shown as an absorbent material, but the absorbent article of the present invention may be other than a disposable diaper, such as a sanitary napkin or an incontinence pad. etc. 1 Disposable diaper 2 Crotch sheet member 3 Abdominal sheet member 4 Back sheet member 11 Liquid permeable sheet 12 Liquid impermeable sheet 13 Absorbent body 14 Leakage prevention wall 15 Absorbent core 16 Covering sheet 17 Leg openings 18, 18' Extending portion 19 Absorbent material 20 Overlapping portions 21, 22 Longitudinal side extending portion 28 Abdominal elastic member 33 First elastic member (dorsal elastic member) 34 Second elastic member (dorsal elastic member) W widest part of the absorbent core