Patent Publication Number: US-9894882-B2

Title: Disposable diaper for pets

Description:
RELATED APPLICATIONS 
     The present application is a National Phase of International Application Number PCT/JP2013/082890, filed Dec. 6, 2013, and claims priority of Japanese Patent Application No. 2012-272383 filed on Dec. 13, 2012. 
     TECHNICAL FIELD 
     The present invention relates to a disposable diaper for pets, and more particularly to a disposable diaper for pets that fits well around a waist of a pet. 
     BACKGROUND ART 
     It is common to keep pets, typically dogs and cats, indoors. Therefore, various kinds of disposable diapers for pets are available. For example, a disposable diaper for pets as disclosed in Japanese Unexamined Patent Application Publication JP 2004-159591A is provided. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: 
     JP 2004-159591A 
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     The disposable diaper for pets (disposable pet diaper) disclosed in JP 2004-159591A is now described with reference to  FIGS. 51 and 52 .  FIG. 51  is a plan view showing the disposable pet diaper in its unfolded state, and  FIG. 52  is an explanatory drawing for illustrating a state of the disposable pet diaper worn by a pet. 
     A disposable pet diaper  1000  includes a liquid-permeable sheet  9910 , a liquid-resistant sheet (not shown) and an absorbent core  2000  disposed between the liquid-permeable sheet  9910  and the liquid-resistant sheet. 
     The liquid-permeable sheet  9910  is formed of liquid-permeable nonwoven fabric. The liquid-resistant sheet is formed of liquid-impermeable plastic film. The absorbent core  2000  is formed of a mixture of liquid absorbent fibers such as pulp, and a super absorbent polymer. 
     The disposable pet diaper  1000  has an abdomen-side waist area  1110 , a back-side waist area  1130  and a crotch area  1120  between the abdomen-side waist area  1110  and the back-side waist area  1130 . 
     The disposable pet diaper  1000  has a diaper longitudinal direction in which the abdomen-side waist area  1110 , the crotch area  1120  and the back-side waist area  1130  are contiguously formed, and a diaper transverse direction crossing the diaper longitudinal direction. 
     The abdomen-side waist area  1110  has an end  1110 A and the back-side waist area  1130  has an end  1130 A in the diaper longitudinal direction. 
     An abdomen-side flap  1150  is formed in the abdomen-side waist area  1110  and has a back-side end  1150 B. The back-side end  1150 B is contiguously formed to extend from an end of the abdomen-side flap  1150  in the diaper transverse direction to a region of an end  2220  of the absorbent core  2000  in the diaper transverse direction. 
     When the disposable pet diaper  1000  is put on a pet, the abdomen-side flap  1150  comes in contact with a leg α 1  of the pet over a relatively long range. 
     A fastening part  3000  having a plurality of hooks is provided in the abdomen-side flap  1150 . 
     The absorbent core  2000  is disposed in a prescribed region extending over the abdomen-side waist area  1110  and the crotch area  1120 . A tail insertion opening  1190  is formed in a prescribed position in the crotch area  1120  and the back-side waist area  1130  where the absorbent core  2000  is not provided. 
     A fastening region  9000  comprising a target tape is formed in a prescribed position of the back-side waist area  1130 . In order to put the disposable pet diaper  1000  on a pet, the hooks on the fastening part  3000  are engaged with the fastening region  9000 . 
     A back-side flap  1160  is formed in the back-side waist area  1130 . 
     A leg stretchable elastic member  4000  is provided in the vicinity of an end of the disposable pet diaper  1000  in the diaper transverse direction. Leg gathers  4410  shown in  FIG. 52  are formed by contraction of the leg stretchable elastic member  4000 . The leg stretchable elastic member  4000  is arranged to extend over part of the abdomen-side waist area  1110  and the crotch area  1120 . Therefore, the contraction force of the leg stretchable elastic member  4000  has no influence on the end  1110 A of the abdomen-side waist area  1110  and the end  1130 A of the back-side waist area  1130 . 
     A leakproof sheet  8000  is arranged to extend inward from the end of the disposable pet diaper  1000  in the diaper transverse direction. A leakproof sheet stretchable elastic member  6000  is provided in the leakproof sheet  8000 . Leakproof gathers and a leakproof wall which are not shown are formed by contraction of the leakproof sheet stretchable elastic member  6000 . 
     An end of the leakproof sheet stretchable elastic member  6000  on the abdomen-side waist area side does not extend up to the end  1110 A of the disposable pet diaper  1000  in the diaper longitudinal direction. The back-side end of the leakproof sheet stretchable elastic member  6000  is arranged to extend beyond the tail insertion opening  1190 . 
     In order to put the disposable pet diaper  1000  on a pet, the back-side waist area  1130  is set on a back of the pet and the crotch area  1120  and the abdomen-side waist area  1110  are set on a crotch and an abdomen of the pet, and then the fastening part  3000  is fastened to the fastening region  9000 . 
     In this prior art disposable pet diaper  1000 , however, the length of the back-side flap  1160  in the transverse direction is relatively long. Therefore, when the disposable pet diaper  1000  is put on a pet α, the back-side flap  1160  may be creased. 
     If the back-side flap  1160  is creased, the disposable pet diaper  1000  does not fit well around the waist of the pet α, which may cause leakage of excrement. 
     Accordingly, it is an object of the present invention to provide a disposable diaper for pets that fits well around a waist of a pet. 
     Means for Solving the Problem 
     In order to solve the above-described problem, according to a preferred mode of the present invention, a disposable diaper for pets is provided which includes a back-side waist area, an abdomen-side waist area, and a crotch area between the back-side waist area and the abdomen-side waist area; a diaper longitudinal direction in which the back-side waist area, the crotch area and the abdomen-side waist area contiguously extend when the disposable diaper is not worn by a pet, and a diaper transverse direction crossing the diaper longitudinal direction; a back-side waist area end in the diaper longitudinal direction, an abdomen-side waist area end in the diaper longitudinal direction, and both ends in the diaper transverse direction; a back-side flap, an abdomen-side flap, a tail insertion opening formed in a prescribed region in the diaper longitudinal direction, an absorbent core formed on one side of the tail insertion opening in the diaper longitudinal direction and disposed in a prescribed region extending over the crotch area and the abdomen-side waist area, a fastening part having a prescribed length and provided in the abdomen-side flap, and a fastening region provided in the back-side waist area and configured to receive the fastening part. 
     Further, the length of the back-side flap in the diaper transverse direction is different from the length of the abdomen-side flap in the diaper transverse direction. 
     When the disposable diaper is put on the pet, the crotch area and the abdomen-side waist area cover a crotch and an abdomen of the pet, while the back-side waist area is closely fitted to a back of the pet, and the fastening part is fastened to the fastening region. 
     Further, the weight of the absorbent core after excretion is received in the longitudinal direction of the fastening part while the disposable diaper is worn by the pet. 
     In an aspect of the solution according to the present invention, the disposable diaper has a pair of diaper minimum width points on the both ends in the diaper transvers direction between which a virtual straight line connecting the both ends in the diaper transverse direction is shortest, a pair of virtual boundary lines extending in the diaper longitudinal direction and passing through the diaper minimum width points, a body that is an inside region between the pair virtual boundary lines, a pair of the back-side flaps formed outside the pair virtual boundary lines in the back-side waist area, an end of the back-side flap in the transverse direction, and a pair of the abdomen-side flaps formed outside the pair virtual boundary lines in the abdomen-side waist area. Further, the length of the back-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the back-side flap in the diaper transverse direction, and the length of the abdomen-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the abdomen-side flap in the diaper transverse direction. 
     In a further aspect of the solution according to the present invention, the length of the back-side flap in the diaper transverse direction is shorter than the length of the abdomen-side flap in the diaper transverse direction. 
     In a further aspect of the solution according to the present invention, the back-side flap is configured such that a distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction varies in the diaper longitudinal direction. 
     In a further aspect of the solution according to the present invention, the end of the back-side flap in the transverse direction has a shape that gradually changes in the diaper longitudinal direction. 
     In a further aspect of the solution according to the present invention, the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve. 
     In a further aspect of the solution according to the present invention, an intermediate region of the back-side flap in the diaper longitudinal direction forms a maximum width region where the distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction becomes maximum. 
     In a further aspect of the solution according to the present invention, the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve which defines the maximum width region having a maximum width. 
     In a further aspect of the solution according to the present invention, the fastening region is provided on a virtual line extending in the diaper transverse direction and passing through the maximum width region of the back-side flap. 
     In a further aspect of the solution according to the present invention, an end of the fastening region in the diaper transverse direction has a different shape from an end of the back-side flap in the diaper transverse direction. 
     In a further aspect of the solution according to the present invention, the end of the fastening region in the diaper transverse direction has a linear shape. 
     Effect of the Invention 
     In this invention, the maximum distance between the virtual boundary line and the end of the back-side flap in the diaper transverse direction is different from the maximum distance between the virtual boundary line and the end of the abdomen-side flap in the diaper transverse direction. Specifically, one of the back-side flap and the abdomen-side flap can be configured to be shorter than the other so that the one flap is hard to crease. Therefore, the disposable diaper for pets fits well around a waist of a pet. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view showing a disposable diaper for pets according to a first embodiment of the present invention, in its unfolded state. 
         FIG. 2  is a plan view for showing an absorbent-core non-arrangement region in the unfolded state of the disposable diaper. 
         FIG. 3  is an explanatory drawing for illustrating the structure of a fastening part. 
         FIG. 4  is an explanatory drawing for illustrating the structure of a flap. 
         FIG. 5  is an explanatory drawing for illustrating the structure of a back-side flap. 
         FIG. 6  is an explanatory drawing for illustrating the structure of an identification region. 
         FIG. 7  is an enlarged view for illustrating the structure of a fastening region. 
         FIG. 8  is an explanatory drawing for illustrating the operation of the fastening region. 
         FIG. 9  is an explanatory drawing regarding to measurement for specifying a preferable structure of an abdomen-side flap. 
         FIG. 10  is an explanatory drawing for illustrating the relation between the disposable diaper and legs of the pet. 
         FIG. 11  is a plan view for showing a leakproof sheet fixed part in the unfolded state of the disposable diaper. 
         FIG. 12  is a sectional view taken along line A-A in  FIG. 1 . 
         FIG. 13  is a sectional view taken along line B-B in  FIG. 1 . 
         FIG. 14  is a sectional view taken along line C-C in  FIG. 1 . 
         FIG. 15  is an explanatory drawing for illustrating the structures of a leg stretchable elastic member and a waist stretchable elastic member. 
         FIG. 16  is an explanatory drawing for illustrating the operations of the leg stretchable elastic member and the waist stretchable elastic member. 
         FIG. 17  is an explanatory drawing in a sectional view taken along line D-D in  FIG. 1 . 
         FIG. 18  is an explanatory drawing regarding to a back-side waist area in putting the disposable diaper on a pet. 
         FIG. 19  is an explanatory drawing regarding to an abdomen-side waist area in putting the disposable diaper on a pet. 
         FIG. 20  is an explanatory drawing for illustrating the state of the disposable diaper worn by a pet. 
         FIG. 21  is an explanatory drawing for illustrating a disposable diaper for pets according to a second embodiment of the present invention. 
         FIG. 22  is an explanatory drawing for illustrating a disposable diaper for pets according to a third embodiment of the present invention. 
         FIG. 23  is an explanatory drawing for illustrating a disposable diaper for pets according to a fourth embodiment of the present invention. 
         FIG. 24  is an explanatory drawing for illustrating a disposable diaper for pets according to a fifth embodiment of the present invention. 
         FIG. 25  is an explanatory drawing for illustrating a disposable diaper for pets according to a sixth embodiment of the present invention. 
         FIG. 26  is an explanatory drawing for illustrating a disposable diaper for pets according to a seventh embodiment of the present invention. 
         FIG. 27  is an explanatory drawing for illustrating the operation of the disposable diaper for pets according to the seventh embodiment of the present invention. 
         FIG. 28  is an explanatory drawing for illustrating a disposable diaper for pets according to an eighth embodiment of the present invention. 
         FIG. 29  is an explanatory drawing for illustrating a disposable diaper for pets according to a ninth embodiment of the present invention. 
         FIG. 30  is an explanatory drawing for illustrating a disposable diaper for pets according to a tenth embodiment of the present invention. 
         FIG. 31  is an explanatory drawing for illustrating a disposable diaper for pets according to an eleventh embodiment of the present invention. 
         FIG. 32  is an explanatory drawing for illustrating a disposable diaper for pets according to a twelfth embodiment of the present invention. 
         FIG. 33  is a plan view showing a disposable diaper for pets according to a 13th embodiment of the present invention, in its unfolded state. 
         FIG. 34  is a plan view showing a disposable diaper for pets according to a 14th embodiment of the present invention, in its unfolded state. 
         FIG. 35  is a plan view showing a disposable diaper for pets according to a 15th embodiment of the present invention, in its unfolded state. 
         FIG. 36  is a plan view showing a disposable diaper for pets according to a 16th embodiment of the present invention, in its unfolded state. 
         FIG. 37  is an enlarged view for illustrating a disposable diaper for pets according to a 17th embodiment of the present invention. 
         FIG. 38  is an explanatory drawing for illustrating the operation of the disposable diaper according to the 17th embodiment of the present invention. 
         FIG. 39  is an enlarged view for illustrating a disposable diaper for pets according to an 18th embodiment of the present invention. 
         FIG. 40  is an enlarged view for illustrating a disposable diaper for pets according to a 19th embodiment of the present invention. 
         FIG. 41  is an enlarged view for illustrating a disposable diaper for pets according to a 20th embodiment of the present invention. 
         FIG. 42  is a plan view showing a disposable diaper for pets according to a 21st embodiment of the present invention, in its unfolded state. 
         FIG. 43  is a plan view showing a disposable diaper for pets according to a 22nd embodiment of the present invention, in its unfolded state. 
         FIG. 44  is a plan view showing a disposable diaper for pets according to a 23rd embodiment of the present invention, in its unfolded state. 
         FIG. 45  is a plan view showing a disposable diaper for pets according to a 24th embodiment of the present invention, in its unfolded state. 
         FIG. 46  is a plan view showing a disposable diaper for pets according to a 25th embodiment of the present invention, in its unfolded state. 
         FIG. 47  is a plan view showing a disposable diaper for pets according to a 26th embodiment of the present invention, in its unfolded state. 
         FIG. 48  is a plan view showing a disposable diaper for pets according to a 27th embodiment of the present invention, in its unfolded state. 
         FIG. 49  is a plan view showing a disposable diaper for pets according to a 28th embodiment of the present invention, in its unfolded state. 
         FIG. 50  is a plan view showing a disposable diaper for pets according to a 29th embodiment of the present invention, in its unfolded state. 
         FIG. 51  is a plan view showing a prior art disposable diaper for pets in its unfolded state. 
         FIG. 52  is an explanatory drawing for illustrating a state of the prior art disposable diaper worn by a pet. 
     
    
    
     BEST MODES FOR CARRYING OUT THE INVENTION 
     (First Embodiment) 
     A first embodiment of the present invention is now described with reference to  FIGS. 1 to 20 . 
       FIG. 1  is a plan view showing a disposable diaper for pets in its unfolded state. The “pet” in this embodiment widely includes vertebrates (mammals, reptiles, birds and amphibians) and invertebrates, and typically represents pets such as cats, dogs, rabbits, hamsters, horses, cows, pigs and goats. The term “unfolded state” as used in this embodiment refers to the state in which an unused disposable diaper for pets is unfolded or opened and a contraction force of a stretchable elastic member is not developed. 
     A disposable diaper for pets (disposable pet diaper)  10  has an abdomen-side waist area  110 , a back-side waist area  130  and a crotch area  120  between the abdomen-side waist area  110  and the back-side waist area  130 . When the disposable pet diaper  10  is worn by a pet, the abdomen-side waist area  110 , the back-side waist area  130  and the crotch area  120  are in contact with an abdomen, a back and a crotch of the pet, respectively. 
     The abdomen-side waist area  110 , the back-side waist area  130  and the crotch area  120  are example embodiments that correspond to the “abdomen-side waist area, the back-side waist area and the crotch area between the abdomen-side waist area and the back-side waist area”, respectively, according to this invention. 
     In the unfolded state as shown in  FIG. 1 , the disposable pet diaper  10  has a diaper longitudinal direction Y in which the abdomen-side waist area  110 , the crotch area  120  and the back-side waist area  130  contiguously extend, and a diaper transverse direction X crossing the diaper longitudinal direction Y. The term “crossing” as used in this specification means “perpendicularly crossing” unless otherwise specified. 
     The diaper longitudinal direction Y and the diaper transverse direction X are example embodiments that correspond to the “diaper longitudinal direction in which the abdomen-side waist area, the crotch area and the back-side waist area contiguously extend when the disposable diaper is not worn by a pet, and a diaper transverse direction crossing the diaper longitudinal direction”, respectively, according to this invention. 
     The disposable pet diaper  10  has an inside surface  100 Z 1  which faces a pet and an outside surface  100 Z 2  opposite to the inside surface  100 Z 1 . 
     In this embodiment, the inside surface  100 Z 1  may also be referred to as a pet-side surface or a pet wearing surface. 
     The disposable pet diaper  10  has an end  110 A formed in the abdomen-side waist area  110  and an end  130 A formed in the back-side waist area  130  in the diaper longitudinal direction Y. 
     The end  110 A formed in the abdomen-side waist area  110  is an example embodiment that corresponds to the “abdomen-side waist area end in the diaper longitudinal direction” according to this invention. 
     The end  130 A formed in the back-side waist area  130  is an example embodiment that corresponds to the “back-side waist area end in the diaper longitudinal direction” according to this invention. 
     The disposable pet diaper  10  has a pair of ends  100 A in the diaper transverse direction X. Each of the ends  100 A contiguously extends over an end  150 B in the diaper transverse direction and a back-side end  150 C in an abdomen-side flap  150 , an end  160 B in the diaper transverse direction in a back-side flap  160 , and a leg-side end  120 A between the back-side end  150 C of the abdomen-side flap  150  and the end  160 B of the back-side flap  160  in the diaper transverse direction. 
     The back-side flap  160  and the abdomen-side flap  150  are example embodiments that correspond to the “back-side flap” and the “abdomen-side flap”, respectively, according to this invention. 
     The ends  100 A are an example embodiment that corresponds to the “both ends in the diaper transverse direction” according to this invention. 
     Further, the end  160 B of the back-side flap  160  in the diaper transverse direction may also be referred to as a lateral end. 
     The end (lateral end)  160 B of the back-side flap  160  in the diaper transverse direction is an example embodiment that corresponds to “an end of the back-side flap in the transverse direction” according to this invention. 
     The disposable pet diaper  10  has a tail insertion opening  190  formed in a prescribed region in the diaper longitudinal direction Y. The tail insertion opening  190  is formed by an arcuate cut  191  extending through the inside surface  100 Z 1  and the outside surface  100 Z 2 . 
     Although, in the first embodiment, the tail insertion opening  190  is formed by the arcuate cut  191 , it may be a circular opening formed by an annular cut. 
     The tail insertion opening  190  is an example embodiment that corresponds to the “tail insertion opening formed in a prescribed region in the diaper longitudinal direction” according to this invention. 
     The disposable pet diaper  10  has an absorbent core  200  formed on one side of the tail insertion opening  190  in the diaper longitudinal direction Y and disposed in a prescribed region extending over the crotch area  120  and the abdomen-side waist area  110 . The absorbent core  200  has an abdomen-side end  210 , a back-side end  220  and a pair of ends  230  in the diaper transverse direction. 
     The absorbent core  200  is formed of a mixture of a particulate or fibrous super absorbent polymer and fluff pulp or a mixture of a particulate or fibrous super absorbent polymer, fluff pulp and thermoplastic synthetic resin fibers. Preferably, in order to prevent deformation of the absorbent core  200  and falling off of the super absorbent polymer, the absorbent core  200  may be entirely covered with a liquid-permeable sheet such as tissue paper and hydrophilic fiber nonwoven fabric. Further, preferably, the absorbent core  200  may be compressed into a prescribed thickness in the manufacturing process. As the super absorbent polymer, synthetic polymer-based, starch-based or cellulose-based polymer can be appropriately used. 
     The absorbent core  200  is an example embodiment that corresponds to the “absorbent core formed on one side of the tail insertion opening in the diaper longitudinal direction and disposed in a prescribed region extending over the crotch area and the abdomen-side waist area” according to this invention. 
     As shown in  FIG. 2 , a region of the disposable pet diaper  10  in which the absorbent core  200  is not disposed is referred to as an absorbent-core non-arrangement region  170 . 
     In the absorbent-core non-arrangement region  170 , regions adjacent to the abdomen-side end  210  and the back-side end  220  of the absorbent core  200  and to the back-side end  130 A of the disposable pet diaper  10  each form an erected region for forming an erected section  700  which is described below. Specifically, the region adjacent to the abdomen-side end  210  of the absorbent core  200 , the region adjacent to the back-side end  220  of the absorbent core  200 , and the region adjacent to the back-side end  130 A of the disposable pet diaper  10  are referred to as an abdomen-side erected region  171 , a crotch-side erected region  173  and a back-side erected region  172 , respectively. 
     Depending on design of the disposable pet diaper  10 , part of the absorbent core  200  may be disposed within the absorbent-core non-arrangement region  170 , especially in any of the erected regions. Specifically, part of tissue paper, pulp fibers or super absorbent polymer may be disposed in the erected region. Even in such a case, if the erected region maintains its flexibility and forms the erected section  700 , the absorbent-core non-arrangement region  170  is considered as being substantially formed and the erected region is also considered as being formed at the same time. 
     The disposable pet diaper  10  has fastening parts  300  on the both ends  150 B of the abdomen-side flap  150  in the diaper transverse direction. 
     As shown in  FIG. 3 , each of the fastening parts  300  has a fastening part longitudinal direction  300 X and a fastening part transverse direction  300 Y. In the fastening part longitudinal direction  300 X, the fastening part  300  has a fixed part  320  in which the fastening part  300  is fixed to the disposable pet diaper  10 , and a free part  310  provided to be fastened to a fastening region  900 . 
     The fastening part  300  is a fiber nonwoven fabric made of polyolefin thermoplastic synthetic fibers, or a plastic film made of polyolefin thermoplastic synthetic resin. A plurality of hooks (not shown) are provided on the diaper inside surface  100 Z 1  of the free part  310 . The hooks are formed of polyolefin thermoplastic synthetic resin. Although the hooks here are provided and configured to be fastened to the fastening region  900 , other structures such as an adhesive can be selected for use in place of the hooks, depending on the structure of the fastening region  900 . 
     The fastening part  300  is an example embodiment that corresponds to the “fastening part having a prescribed length and provided in the abdomen-side flap (the abdomen-side waist area)” according to this invention. 
     The disposable pet diaper  10  has flaps  140 A. The flaps  140 A include a pair of abdomen-side flaps  150  formed on the both ends  100 A in the diaper transverse direction in the abdomen-side waist area  110 , and a pair of back-side flaps  160  formed on the both ends  100 A in the diaper transverse direction in the back-side waist area  130 . The flaps  140 A are defined by a pair of virtual lines  100 Y 1  extending in the diaper longitudinal direction and passing through a pair of minimum width points  100 AP on the ends  100 A of the disposable pet diaper  10  in the diaper transverse direction between which a line connecting the ends  100 A in the diaper transverse direction is shortest. Specifically, the virtual lines  100 Y 1  are referred to as flap boundary lines, and regions outside a pair of the flap boundary lines  100 Y 1  are referred to as flaps (the abdomen-side flaps  150 , the back-side flaps  160 ), while an inside region between the flap boundary lines  100 Y 1  is referred to as a body  140 B. Further, each of the flap boundary lines  100 Y 1  itself can also be defined as a reference virtual straight line which is an arbitrary straight line extending in the diaper longitudinal direction. The pair of abdomen-side flaps  150  includes an abdomen-side flap  150  and a further abdomen-side flap  150 . The pair of back-side flaps  160  includes a back-side flap  160  and a further back-side flap  160 . 
     The minimum width points  100 AP are an example embodiment that corresponds to “a pair of diaper minimum width points on the both ends in the diaper transverse direction between which a virtual straight line connecting the both ends in the diaper transverse direction is shortest” according to this invention. 
     The flap boundary lines  100 Y 1  are an example embodiment that corresponds to “a pair of virtual boundary lines extending in the diaper longitudinal direction and passing through the diaper minimum width points” according to this invention. 
     The body  140 B is an example embodiment that corresponds to “a body comprising an inside region between the pair virtual boundary lines” according to this invention. 
     The abdomen-side flaps  150  are an example embodiment that corresponds to “a pair of the abdomen-side flaps formed outside the pair virtual boundary lines in the abdomen-side waist area” according to this invention. 
     The back-side flaps  160  are an example embodiment that corresponds to “a pair of the back-side flaps formed outside the pair virtual boundary lines in the back-side waist area” according to this invention. 
     The structure of the flap  140 A is now described with reference to  FIG. 4 . In  FIG. 4 , for comparison, the abdomen-side flap  150  and the back-side flap  160  are shown aligned vertically on the flap boundary line  100 Y 1 . 
     First, the length of the flap  140 A in the diaper transverse direction X is defined. Where a straight line in the diaper transverse direction X which connects points on the both ends in the diaper transverse direction in each pair of the flaps  140 A is longest, the points are defined as maximum width points. The maximum width points are shown as a maximum width point  150 AP and a maximum width point  160 AP in the abdomen-side flap  150  and the back-side flap  160 , respectively. 
     Next, the shortest distance between the flap boundary line  100 Y 1  and the maximum width points is measured and defined as a length of the flap  140 A in the diaper transverse direction X. The length of the flap  140 A in the diaper transverse direction X is shown as a length  150 L of the abdomen-side flap  150  and a length  160 L of the back-side flap  160 . 
     The length  160 L of the back-side flap  160  is an example embodiment that corresponds to a feature that “the length of the back-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the back-side flap in the diaper transverse direction” according to this invention. 
     The length  150 L of the abdomen-side flap  150  is an example embodiment that corresponds to a feature that “the length of the abdomen-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the abdomen-side flap in the diaper transverse direction” according to this invention. 
     In this invention, the length  150 L of the abdomen-side flap  150  is different from the length  160 L of the back-side flap  160 . This is an example embodiment that corresponds to a feature that “the length of the back-side flap in the diaper transverse direction is different from the length of the abdomen-side flap in the diaper transverse direction” and to a feature that “the maximum distance between the virtual boundary line and the end of the back-side flap in the diaper transverse direction is different from the maximum distance between the virtual boundary line and the end of the abdomen-side flap in the diaper transverse direction” according to this invention. 
     With such a structure, one of the abdomen-side flap  150  and the back-side flap  160  can be made shorter in the diaper transverse direction X. Consequently, the possibility of occurrence of crease of the shorter flap  140 A can be reduced. 
     The “crease” in this embodiment encompasses a state in which the inside surfaces  100 Z 1  of the flaps  140 A contact each other, a state in which the outside surfaces  100 Z 1  of the flaps  140 A contact each other, and a state in which the flaps  140 A are creased or wrinkled to such an extent as to impair the fitness of the disposable pet diaper  10  to the pet α. 
     Further, in the first embodiment of this invention, the length  160 L of the back-side flap  160  is configured to be shorter than the length  150 L of the abdomen-side flap  150 . This is an example embodiment that corresponds to the feature that “the length of the back-side flap in the diaper transverse direction is shorter than the length of the abdomen-side flap in the diaper transverse direction” according to this invention. 
     Next, the structure of the back-side flap  160  is now described with reference to  FIG. 5 . 
     The lateral end  160 B of the back-side flap  160  is shaped such that the distance in the diaper transverse direction X between the lateral end  160 B and the flap boundary line  100 Y 1  is not uniform. 
     This is an example embodiment that corresponds to the feature that “the back-side flap is configured such that a distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction varies in the diaper longitudinal direction” according to this invention. 
     Thus, the lateral end  160 B of the back-side flap  160  is formed such that its shape gradually changes in the diaper longitudinal direction Y. 
     This is an example embodiment that corresponds to the feature that “the end of the back-side flap in the transverse direction has a shape that gradually changes in the diaper longitudinal direction” according to this invention. 
     Specifically, in this embodiment, the lateral end  160 B of the back-side flap  160  has a circular arc shape. In this embodiment, the “circular arc shape” is not limited to the shape of a circular arc of a perfect circle, but it also includes other circular arc shapes such as that of an ellipse and a combination of circular arc shapes of a perfect circle and an ellipse. Accordingly, the “circular arc shape” in this embodiment may also be referred to as a shape other than a linear shape. 
     This specific shape of the lateral end  160 B of the back-side flap  160  is an example embodiment that corresponds to the feature that “the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve” according to this invention. 
     By thus shaping the lateral end  160 B of the back-side flap  160 , when the user grabs the back-side flap  160 , the user can easily confirm by the feel which part of the lateral end  160 B of the back-side flap  160  the user is grabbing. 
     A maximum width region  160 B 1  is formed in a central region of the lateral end  160 B of the back-side flap  160  where the distance between the lateral end  160 B and the flap boundary line  100 Y 1  becomes maximum. The “central region” as used in this embodiment refers to a region not having an identification region  10 A especially in a structure in which the identification region  10 A (which is described below) is formed by extending the back-side end  160 A of the back-side flap  160 . 
     The maximum width region  160 B 1  is an example embodiment that corresponds to the feature that “an intermediate region of the back-side flap in the diaper longitudinal direction forms a maximum width region where the distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction becomes maximum” according to this invention. 
     The maximum width region  160 B 1  is formed by defining the lateral end  160 B of the back-side flap  160  by a circular arc curve which defines the maximum width region  160 B 1  having a maximum width (such that the back-side flap  160  has a maximum width at the maximum width region  160 B 1 ). 
     This is an example embodiment that corresponds to the feature that “the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve which defines the maximum width region having a maximum width” according to this invention. 
     By providing the maximum width region  160 B 1 , when the user grabs the back-side flap  160 , the user can more easily confirm by the feel which part of the lateral end  160 B of the back-side flap  160  the user is grabbing. 
     The fastening region  900  which is described below is formed on a virtual line  160 B 11  extending in the diaper transverse direction X and passing through the maximum width region  160 B 1 . 
     This is an example embodiment that corresponds to the feature that “the fastening region is provided on a virtual line extending in the diaper transverse direction and passing through the maximum width region of the back-side flap” according to this invention. 
     Specifically, a second fastening region  900 B in the fastening region  900  is provided on the virtual line  160 B 11  extending in the diaper transverse direction X and passing through the maximum width region  160 B 1 . 
     Due to such a relation between the maximum width region  160 B 1  and the fastening region  900 , the user can more easily position the fastening part  300  of the abdomen-side flap  150  on the fastening region  900  of the back-side flap  160 . Specifically, when the user grabs the back-side flap  160 , the user can recognize the maximum width region  160 B 1  and thus can recognize the position of the fastening region  900  at the same time. 
     Further, an end  900 BB of the fastening region  900  in the diaper transverse direction X has a different shape from the lateral end  160 B of the back-side flap  160 . The end  900 BB of the fastening region  900  in the diaper transverse direction X is also referred to as the “lateral end”. 
     This is an example embodiment that corresponds to the feature that “an end of the fastening region in the diaper transverse direction has a different shape from an end of the back-side flap in the diaper transverse direction” according to this invention. 
     Specifically, the lateral end  900 BB of the second fastening region  900 B has a linear shape parallel to the diaper longitudinal direction Y, while the lateral end  160 B of the back-side flap  160  has a curved shape. 
     The lateral end  900 BB of the fastening region  900  (the second fastening region  900 B) having a linear shape is an example embodiment that corresponds to the feature that “the end of the fastening region in the diaper transverse direction has a linear shape” according to this invention. 
     Due to such a relation between the lateral end  160 B of the back-side flap  160  and the lateral end  900 BB of the fastening region  900 , the user can more easily position the fastening part  300  of the abdomen-side flap  150  on the fastening region  900  of the back-side flap  160 . Specifically, when the user grabs the back-side flap  160 , the user can recognize the maximum width region  160 B 1  and thus can recognize the position of the fastening region  900  at the same time. Further, from the difference in shape between the lateral end  160 B of the back-side flap  160  and the lateral end  900 BB of the fastening region  900 , the user can easily recognize the position of the lateral end  900 BB of the fastening region  900  itself or the position in the fastening region  900  in the diaper transverse direction X. 
     The identification region  10 A is formed in the flap  140 A and provided to allow the user to identify an abnormality of the back-side flap  160  by visually and externally checking the disposable pet diaper  10  worn by the pet α. 
     In this respect, in this embodiment, if the identification region  10 A is visible from outside the disposable pet diaper  10 , “the back-side flap  160  is determined to be in a normal state”. On the other hand, if the identification region  10 A is not visible from outside the disposable pet diaper  10 , “the back-side flap  160  is determined to be in an abnormal state”. In this embodiment, the “identification region  10 A is visible” means not only that “the whole identification region  10 A is visible”, but also that “part of the identification region  10 A is visible”. Specifically, it is sufficient that a user is allowed to recognize whether the back-side flap  160  is in a normal state or in an abnormal state by “visually checking part of the identification region  10 A”. 
     The “normal state” of the back-side flap  160  refers to a state that the back-side flap  160  is not creased when the disposable pet diaper  10  is worn by the pet α, while the “abnormal state” of the back-side flap  160  refers to a state that the back-side flap  160  is creased when the disposable pet diaper  10  is worn by the pet α. 
     Next, the structure of the identification region  10 A is more specifically explained. 
     In this embodiment, the identification region  10 A is formed in the back-side flap  160 . 
     The identification region  10 A is formed by extending the back-side end  160 A in the diaper longitudinal direction Y and a region of the lateral end  160 B contiguous to the back-side end  160 A in the back-side flap  160 , in the diaper transverse direction X. This identification region  10 A formed by extending a prescribed region of the lateral end  160 B of the back-side flap  160  is referred to as a first extended identification region  10 A 1 . 
     The identification region  10 A is configured to protrude from an end  150 A of the abdomen-side flap  150  in the diaper longitudinal direction Y when the disposable pet diaper  10  is worn by the pet α. 
     The structure in which the identification region  10 A protrudes from the end  150 A of the abdomen-side flap  150  is now specifically described with reference to  FIG. 6 . 
     In  FIG. 6 , the abdomen-side flap  150  and the back-side flap  160  are shown side by side so as to make it easy to understand the relation between the identification region  10 A in the back-side flap  160  and the abdomen-side flap  150 . 
     First, a virtual line extending in the diaper transverse direction X from an end of the identification region  10 A in the diaper longitudinal direction Y in the back-side flap  160  is referred to as a first virtual line  10 A 11 . 
     Next, a virtual line extending in the diaper transverse direction X from a back-side end  900 BC of the second fastening region  900 B of the fastening region  900  in the back-side flap  160  is referred to as a second virtual line  900 BC 1 . 
     Then, a virtual line connecting the first virtual line  10 A 11  and the second virtual line  900 BC 1  and extending in the diaper longitudinal direction Y is referred to as a third virtual line D 160 . 
     Further, a virtual line extending in the diaper transverse direction X from a back-side end  300 C of the fastening part  300  in the abdomen-side flap  150  is referred to as a fourth virtual line  300 C 1 . 
     Further, a virtual line extending from an abdomen-side end  150 A of the abdomen-side flap  150  in the diaper transverse direction X is referred to as a fifth virtual line  150 A 1 . 
     Further, a virtual line connecting the fourth virtual line  300 C 1  and the fifth virtual line  150 A 1  and extending in the diaper longitudinal direction Y is referred to as a sixth virtual line D 150 . 
     The third virtual line D 160  is longer than the sixth virtual line D 150 . 
     By provision of such configuration, the identification region  10 A can be easily identified. 
     Specifically, when the disposable pet diaper  10  is put on the pet α, the identification region  10 A always protrudes from the abdomen-side end  150 A of the abdomen-side flap  150  wherever the free part  310  of the fastening part  300  in the abdomen-side flap  150  is fastened to the second fastening region  900 B of the fastening region  900  in the back-side flap  160 . 
     The fastening region  900  is now explained, starting with its basic structure with reference to  FIG. 1 . 
     The fastening region  900  is formed at least in the back-side waist area  130  in the disposable pet diaper  10  and can be removably engaged with a hook part provided in the free part  310  of the fastening part  300 . 
     The fastening region  900  is an example embodiment that corresponds to the “fastening region provided in the back-side waist area and configured to receive the fastening part” according to this invention. 
     In the fastening region  900 , nonwoven fabric which can be removably engaged with the hook part of the fastening part  300  is used as an outer sheet  930  which forms the outside surface  100 Z 2  of the disposable pet diaper  10 . A first fastening region  900 A is formed by this nonwoven fabric which can be removably engaged with the hook part of the fastening part  300 . 
     The first fastening region  900 A is provided in the absorbent-core non-arrangement region  170 , or specifically, configured to be placed on the back-side of the pet α. Allowing for some pets a having large inclination on the back, the fastening region  900  for fixing the fastening part  300  needs to have a flexible structure in order to fit on the back of the pets a. 
     Further, a back-side waist stretchable elastic member  520  which is described below is arranged to extend in the diaper transverse direction in the absorbent-core non-arrangement region  170  within the back-side waist area  130  of the disposable pet diaper  10 . More specifically, the back-side waist stretchable elastic member  520  is provided in a stretched state in the vicinity of the back-side end  130 A of the disposable pet diaper  10 . 
     The back-side waist stretchable elastic member  520  contracts when the disposable pet diaper  10  is put on the pet. As a result, a first back-side curved part  542  (which is described below) is formed, so that the back-side waist area  130  of the disposable pet diaper  10  can be more easily put on the pet α. 
     A force of engagement between the first fastening region  900 A and the fastening part  300  is preferably in a range of 1.1 to 4.2 N. 
     The second fastening region  900 B is provided on the outside surface  100 Z 2  in the first fastening region  900 A and has a stronger force of engagement with the hook part of the fastening part  300  than the first fastening region  900 A. 
     Specifically, the second fastening region  900 B is formed by a target tape which is a fiber nonwoven fabric made of polyolefin thermoplastic synthetic fibers, or a plastic film made of polyolefin thermoplastic synthetic resin, and having a large number of loops (not shown) made of polyolefin thermoplastic synthetic resin. 
     Due to such a structure, the disposable pet diaper  10  can be more firmly put on the pet α. 
     Specifically, when the user puts the disposable pet diaper  10  on the pet α, only part of the hook part of the fastening part  300  may be fastened to the second fastening region  900 B (target tape). Even in such a case, the other part of the hook part which is not fastened to the second fastening region  900 B is fastened to the first fastening region  900 A. Therefore, in any situation, the hook part of the fastening part  300  is fastened to either the first fastening region  900 A or the second fastening region  900 B, so that the disposable pet diaper  10  can be securely put on the pet α. 
     The structure of the first fastening region  900 A is now described with reference to  FIGS. 7 and 8 . 
       FIG. 7  is an enlarged, explanatory view showing the first fastening region  900 A, and  FIG. 8  is an enlarged, explanatory view showing surrounding parts  930 D formed in the first fastening region  900 A. 
     The outer sheet  930  forms the first fastening region  900 A and is formed of thermoplastic fibers. 
     The outer sheet  930  has a first welded part  930 A extending in a first direction and formed by melting of the thermoplastic fibers. 
     A plurality of such first welded parts  930 A form a first welded part group  930 AA. 
     Further, each pair of adjacent ones of the first welded parts  930 A form a first adjacent welded part group  930 AB. 
     The outer sheet  930  further has a second welded part  930 B extending in a second direction crossing the first direction and formed by melting of the thermoplastic fibers. The term “crossing” here does not necessarily mean “perpendicularly crossing”. 
     A plurality of such second welded parts  930 B form a second welded part group  930 BA. 
     Further, each pair of adjacent ones of the second welded parts  930 B form a second adjacent welded part group  930 BB. 
     The surrounding parts  930 D each having a parallelogram shape are formed in regions surrounded by the first adjacent welded part group  930 AB and the second adjacent welded part group  930 BB which intersect with each other. The “parallelogram” as used herein includes a square and a rectangle. 
     The outer sheet  930  further has a third welded part  930 C extending in a third direction crossing the first and second directions and formed within the surrounding part  930 D by melting of the thermoplastic fibers. The term “crossing” here does not necessarily mean “perpendicularly crossing”. 
     A plurality of such third welded parts  930 C form a third welded part group  930 CA. 
     Further, each pair of adjacent ones of the third welded parts  930 C form a third adjacent welded part group  930 CB. 
     A first loop part  930 L 1  is formed between the first welded part  930 A and the third welded part  930 C by thermoplastic fibers which are not welded. Specifically, the first loop part  930 L 1  is fixed at both ends to the first and third welded parts  930 A,  930 C and formed in a loop by fibers extending between the both ends. The first loop part  930 L 1  can be removably engaged with the hook part of the fastening part  300 . 
     A second loop part  930 L 2  is formed between the second welded part  930 B and the third welded part  930 C by thermoplastic fibers which are not welded. Specifically, the second loop part  930 L 2  is fixed at both ends to the second and third welded parts  930 B,  930 C and formed in a loop by fibers extending between the both ends. The second loop part  930 L 2  can be removably engaged with the hook part of the fastening part  300 . 
     The surrounding part  930 D has a parallelogram shape having a first diagonal line  930 D 1  and a second diagonal line  930 D 2 . Further, the surrounding part  930 D is partitioned into a first surrounding part  930 DA and a second surrounding part  930 DB by the third welded part  930 C. 
     The third direction in which the third welded part  930 C extends is preferably parallel to one of the diagonal lines of the parallelogram which defines the surrounding part  930 D. 
     Further, in this case, the third welded part  930 C is preferably formed to coincide with one of the diagonal lines of the parallelogram which defines the surrounding part  930 D. In this embodiment, the third welded part  930 C is arranged to coincide with the first diagonal line  930 D 1  of the diagonal line  930 D. By such arrangement of the third welded part  930 C on the diagonal line of the surrounding part  930 D, the first surrounding part  930 DA and the second surrounding part  930 DB have the same size. Therefore, the first and second loops  930 L 1 ,  930 L 2  formed in the first and second surrounding parts  930 DA,  930 DB can be made uniform in size between the first surrounding part  930 DA and the second surrounding part  930 DB. 
     The surrounding part  930 D has a first side  930 D 3  and a second side  930 D 4 . In order to obtain satisfactorily engaged state with respect to the hook part of the fastening part  300  which is generally used, it is preferable that a length D 930 D 3  of the first side  930 D 3  and a length D 930 D 4  of the second side  930 D 4  of the surrounding part  930 D are each in a range of 2 to 10 mm. 
     In this embodiment, the first welded part  930 A has a continuous linear shape and forms a first welded continuous line  930 A 1 . 
     In this embodiment, the second welded part  930 B has a continuous linear shape and forms a second welded continuous line  930 B  1 . 
     In this embodiment, the third welded part  930 C has a continuous linear shape and forms a third welded continuous line  930 C 1 . 
     The width of each of the first welded part  930 A and the second welded part  930 B is preferably in a range of 0.2 to 2 mm. The width of the third welded part  930 C is preferably in a range of 0.2 to 5 mm. The distance between each pair of the third welded parts  930 C which form third adjacent welded part group is preferably in a range of 2 to 10 mm By provision of such settings of the widths of the first and second welded parts  930 A,  930 B and the distance between each pair of the third welded parts  930 C which form the third adjacent welded part group, the first fastening region  900 A can be prevented from impairing flexibility and touch feeling as the outer sheet  930  which forms the outside surface  100 Z 2  of the disposable pet diaper  10 . 
     Operation of the first fastening region  900 A is now described. 
     The user attaches the hook part of the fastening part  300  to the first fastening region  900 A in order to put the disposable pet diaper  10  on the pet α. At this time, the hook part of the fastening part  300  is engaged with at least one of the first loop parts  930 L 1  and the second loop parts  930 L 2 . 
     When a shearing force is generated in the fastening part  300 , the first loop parts  930 L 1  and the second loop parts  930 L 2  engaged with the hook part of the fastening part  300  move as the hook part moves. At this time, however, the both ends of the first loop parts  930 L 1  are fixed to the first welded parts  930 A and the third welded parts  930 C, and the both ends of the second loop parts  930 L 2  are fixed to the second welded parts  930 B and the third welded parts  930 C. Therefore, movement of the first loop parts  930 L 1  and the second loop parts  930 L 2  is restricted, so that the loop parts are not easily disengaged from the hook part. 
     The outer sheet  930  forming the first fastening region  900 A is an assembly of filaments or staples, more preferably an assembly of filaments, of thermoplastic fibers having fineness of 1 to 3 dtex. It is preferable that the staples, if used, have at least twice the length of the longest side of the surrounding part  930 D (which is described below), specifically a length of 50 mm or longer. 
     The outer sheet  930  has a mass per unit area of 15 to 40 g/m 2 . 
     The outer sheet  930  can take the form of nonwoven fabric by forming the first, second and third welded parts  930 A,  930 B,  930 C in the assembly of such filaments or staples. In place of such nonwoven fabric, the first, second and third welded parts  930 A,  930 B,  930 C may be formed in other forms of nonwoven fabric, such as thermal bond nonwoven fabric. 
     In order to form the outer sheet  930  forming the first fastening region  900 A, first, a web formed of the assembly of thermoplastic fibers for forming the outer sheet  930  is obtained. 
     Pressure is locally applied to the web by a heated emboss roller, while the web is continuously fed in one direction. The thermoplastic fibers are welded by the heated emboss roller, and the first, second and third welded parts  930 A,  930 B,  930 C are formed. The web is fixed by the first, second and third welded parts  930 A,  930 B,  930 C. In this manner, the outer sheet  930  is obtained. 
     The emboss roller is used in a state of being heated up to a temperature at which the thermoplastic fibers melt. The first, second and third welded parts  930 A,  930 B,  930 C thus obtained are welded to such an extent that the thermoplastic fibers cannot be separated from each other. 
     In this manner, the first, second and third welded parts  930 A,  930 B,  930 C are formed by the emboss roller. Therefore, the first, second and third welded parts  930 A,  930 B,  930 C are recessed compared with other parts of the outer sheet  930  not having these welded parts. 
     Therefore, in the disposable pet diaper  10  using the outer sheet  930 , the first, second and third welded parts  930 A,  930 B,  930 C are recessed from the outside surface  100 Z 2  of the fastening region  900 . 
     Specifically, the surrounding part  930 D in which the first, second and third welded parts  930 A,  930 B,  930 C are not formed forms a raised part in the outside surface  100 Z 2  of the first fastening region  900 A of the fastening region  900 . 
     Such configuration facilitates user&#39;s operation of fixing the hook part of the fastening part  300  to the first fastening region  900 A. 
     Now, the structure of the abdomen-side flap  150  is explained. 
     As shown in  FIG. 3 , in the abdomen-side flap  150 , the free end  310  of the fastening part  300  protrudes from the end  150 B in the diaper transverse direction. A point which bisects the fastening part  300  in the fastening part transverse direction  300 Y on a boundary between the end  150 B and the fastening part  300  is referred to as a fastening part midpoint  300 P  1 . 
     Further, the back-side end  150 C of the abdomen-side flap  150  is arcuately formed and extends contiguously from the end  150 B of the abdomen-side flap  150  in the diaper transverse direction to the leg-side end  120 A. 
     A preferable structure of the abdomen-side flap  150  is now described with reference to  FIGS. 9 and 10 . 
     In  FIG. 9 , a diaper longitudinal center line  100 Y 2  passes through the center of the disposable pet diaper  10  in the diaper transverse direction X. Specifically, the diaper longitudinal center line  100 Y 2  coincides with a line connecting an abdomen-side end center point  110 AP on the center of the abdomen-side end  110 A and a back-side end center point  130 AP on the center of the back-side end  130 A in the disposable pet diaper  10 . 
     The length between the abdomen-side end  110 A and the back-side end  130 A on the diaper longitudinal center line  100 Y 2  is referred to as a diaper longitudinal length D 1 . 
     Further, a point which bisects the diaper longitudinal length D 1  is referred to as a diaper center point  100 P. 
     In providing the structure of the abdomen-side flap  150 , the inventor focused on the relation between straight lines connecting the fastening part midpoint  300 P 1  of the fastening part  300  and the diaper longitudinal center line  100 Y 2  and the shape of the back-side end  150 C of the abdomen-side flap  150 . 
     Especially, the relation between a shortest straight-line distance  300 L of a straight line passing the back-side end  150 C of the abdomen-side flap  150 , among the straight lines connecting the fastening part midpoint  300 P 1  of the fastening part  300  and the diaper longitudinal center line  100 Y 2 , and a point of intersection of this straight line with the diaper longitudinal center line  100 Y 2  or a shortest line point  300 P 2  was focused on. 
     As a result of keen studies, it was found that the abdomen-side flap  150  has a suitable and advantageous structure when the shortest line point  300 P 2  is located on the abdomen-side end  110 A side of the disposable pet diaper  10  beyond the diaper center point  100 P. 
     Specifically, the position of the shortest line point  300 P 2  has a great influence on the shape of the back-side end  150 C of the abdomen-side flap  150 . As described above, the back-side end  150 C is arcuate and extends from the end  150 B of the abdomen-side flap  150  in the diaper transverse direction to the leg-side end  120 A of the disposable pet diaper  10 . 
     In this respect, assuming that the shortest line point  300 P 2  is located on the back-side end  130 A side beyond the diaper center point, the position at which the back-side end  150 C of the abdomen-side flap  150  meets the leg-side end  120 A is located closer to the back-side end  130 A than that in the present invention. As a result, the area of the abdomen-side flap  150  is increased. Therefore, when the disposable pet diaper  10  is put on the pet α, the abdomen-side flap  150  comes in contact with a leg α 1  of the pet over a longer range. 
     In the position of the shortest line point  300 P 2  according to this invention, however, as shown in  FIG. 10 , the area of the abdomen-side flap  150  can be reduced, and the length with which the back-side end  150 C of the abdomen-side flap  150  comes in contact with the leg α 1  of the pet can be reduced. 
     The disposable pet diaper  10  is available in various sizes corresponding to pets of various sizes. The pets here are limited to cats and dogs. In this case, when a measured length D 2  or a distance between the shortest line point  300 P 2  and the abdomen-side end center point  110 AP of the disposable pet diaper  10 , is set to 170 to 250 mm, the suitable and advantageous abdomen-side flap  150  can be provided in the disposable pet diaper  10  of any size. 
     Further, the relation between the measured length D 2  and the diaper longitudinal length D 1  of the disposable pet diaper  10  was also considered. As a result, it was found that the suitable and advantageous abdomen-side flap  150  can be provided in the disposable pet diaper  10  of any size when the ratio of the measured length D 2  to the diaper longitudinal length D 1  is 45.5 to 50.0%. 
     In the disposable pet diaper  10 , a leg stretchable elastic member  400  is provided in the absorbent-core non-arrangement region  170  between the end  100 A in the diaper transverse direction and the absorbent core  200 . 
     The leg stretchable elastic member  400  is arranged in a stretched state, and when using the disposable pet diaper  10 , the leg stretchable elastic member  400  contracts to form leg gathers  410  which are described below. 
     The leg stretchable elastic member  400  is arranged to extend from the abdomen-side end  110 A to the back-side end  130 A of the disposable pet diaper  10  in the diaper longitudinal direction Y. 
     Here, “to extend from the abdomen-side end  110 A to the back-side end  130 A” of the disposable pet diaper  10  does not only mean that the leg stretchable elastic member  400  continuously extends from the abdomen-side end  110 A to the back-side end  130 A. Specifically, the leg stretchable elastic member  400  may be arranged to extend with a distance from the abdomen-side end  110 A or the back-side end  130 A only if the abdomen-side end  110 A or the back-side end  130 A is acted upon by the contraction force of the leg stretchable elastic member  400  and the erected section  700  is formed. 
     The leg stretchable elastic member  400  is formed of synthetic or natural rubber thread. 
     The disposable pet diaper  10  has a waist stretchable elastic member  500 . The waist stretchable elastic member  500  includes an abdomen-side waist stretchable elastic member  510  disposed in the absorbent-core non-arrangement region  170  between the end  110 A in the diaper longitudinal direction and the abdomen-side end  210  of the absorbent core  200 , and a back-side waist stretchable elastic member  520  disposed in the absorbent-core non-arrangement region  170  between the end  130 A in the diaper longitudinal direction and the back-side end  220  of the absorbent core  200 . 
     The waist stretchable elastic member  500  is arranged in a stretched state, and when using the disposable pet diaper  10 , the waist stretchable elastic member  500  contracts to form waist gathers  530 . 
     The waist stretchable elastic member  500  and the leg stretchable elastic member  400  are arranged to overlap each other. Here, the term “overlap” as used in this embodiment does not only mean that the waist stretchable elastic member  500  and the leg stretchable elastic member  400  are in direct contact with each other. Specifically, the waist stretchable elastic member  500  and the leg stretchable elastic member  400  do not need to be in direct contact with each other only if their contraction forces act upon each other such that a contraction force intersecting region  180  is formed. 
     The waist stretchable elastic member  500  is formed of a urethane foamed sheet material. 
     The disposable pet diaper  10  has a leakproof sheet  800 . 
     A leakproof sheet stretchable elastic member  600  is disposed in a stretched state in the leakproof sheet  800 . 
     The leakproof sheet  800  is disposed in a prescribed region extending from each of the ends  100 A in the transverse direction of the disposable pet diaper  10  to the body  140 B of the disposable pet diaper  10 . 
     The leakproof sheet stretchable elastic member  600  is disposed within a space which is created by a folded part  810  of an inner end of the leakproof sheet  800  and extends in the diaper longitudinal direction Y. 
     As shown in  FIG. 11 , the leakproof sheet  800  has a fixed part  830  which is fixed to other components (a liquid-permeable sheet  910 , a liquid-resistant sheet  920 , an outer sheet  930 ) of the disposable pet diaper  10  by an adhesive (not shown). In  FIG. 11 , the fixed part  830  is shown by hatching. 
     The fixed part  830  is not formed in a region of the leakproof sheet  800  which extends in the diaper longitudinal direction Y and overlaps with the end  230  of the absorbent core  200  in the diaper transverse direction X. This region not having the fixed part  830  is erected by contraction of the leakproof sheet stretchable elastic member  600  and forms a leakproof wall  820  which is described below. Further, leakproof gathers  840  are formed in the leakproof sheet  800  by contraction of the leakproof sheet stretchable elastic member  600 . 
     The leakproof sheet stretchable elastic member  600  does not need to be provided along the whole length of the region (which forms the leakproof wall  820 ) not having the fixed part  830  in the diaper longitudinal direction Y. For example, it is sufficient to provide the leakproof sheet stretchable elastic member  600  only in part of the region of the leakproof wall  820  in the diaper longitudinal direction Y. Specifically, it is sufficient for the contraction force of the leakproof sheet stretchable elastic member  600  to act upon a part of the fixed part  830  on the both ends of the region of the leakproof wall  820  in the diaper longitudinal direction Y. Here, the part of the fixed part  830  on the both ends of the region of the leakproof wall  820  in the diaper longitudinal direction Y is referred to as a contraction force fixing part  610 . 
     The contraction force fixing part  610  includes an abdomen-side contraction force fixing part  620  and a back-side contraction force fixing part  630 . 
     The back-side contraction force fixing part  630  is provided between the back-side end  220  of the absorbent core  200  and the tail insertion opening  190 . Specifically, by provision of this structure, the absorbent-core non-arrangement region  170  between the back-side end  220  of the absorbent core  200  and the tail insertion opening  190  is erected by contraction of the leakproof sheet stretchable elastic member  600  and forms the erected section  700 . 
     Further, the abdomen-side contraction force fixing part  620  is provided between the abdomen-side end  210  of the absorbent core  200  and the abdomen-side end  110 A of the disposable pet diaper  10 . Specifically, by provision of this structure, as described below, the absorbent-core non-arrangement region  170  between the abdomen-side end  210  of the absorbent core  200  and the abdomen-side end  110 A of the disposable pet diaper  10  is erected by contraction of the leakproof sheet stretchable elastic member  600  and forms the erected section  700 . 
     The disposable pet diaper  10  includes the liquid-permeable sheet  910 , the absorbent core  200 , the liquid-resistant sheet  920 , the outer sheet  930  and the leakproof sheet  800 . 
     As shown in  FIGS. 12 to 14 , the liquid-permeable sheet  910  is disposed on the inside surface  100 Z 1  side of the disposable pet diaper  10 . The absorbent core  200  is disposed between the liquid-permeable sheet  910  and the liquid-resistant sheet  920 . The outer sheet  930  is disposed on the outside surface  100 Z 2  side of the liquid-resistant sheet  920 . The leakproof sheet  800  is disposed over the liquid-permeable sheet  910 , the liquid-resistant sheet  920  and the outer sheet  930  in the diaper transverse direction X. As a result, the abdomen-side flap  150  and the back-side flap  160  are formed by the leakproof sheet  800  and the outer sheet  930 . 
     The leg stretchable elastic member  400  is disposed between the leakproof sheet  800  and the liquid-resistant sheet  920 . 
     The leakproof sheet stretchable elastic member  600  is disposed in the space inside the folded part  810  formed on the end of the leakproof sheet  800 . 
     As shown in  FIG. 12 , the fastening part  300  is disposed between the leakproof sheet  800  and the outer sheet  930 . 
     As shown in  FIGS. 12 and 13 , the leakproof sheet  800  not having the fixed part  830  is erected by contraction of the leakproof sheet stretchable elastic member  600  and forms the leakproof wall  820 . At this time, a large number of creases or the leakproof gathers  840  are formed in the leakproof sheet  800 . 
     As shown in  FIG. 14 , the second fastening region  900 B of the fastening region  900  is provided on the outside surface  100 Z 2  of the outer sheet  930 . 
     The waist stretchable elastic member  500 , not shown, is disposed between the liquid-permeable sheet  910  and the liquid-resistant sheet  920 . 
     The liquid-permeable sheet  910 , the liquid-resistant sheet  920 , the outer sheet  930  and the leakproof sheet  800  are formed of nonwoven fabric. The nonwoven fabric can be selected from those manufactured by spun lacing, needle punching, melt blowing, thermal bonding, spun bonding or chemical bonding. 
     An adhesive, not shown, is used to fix the liquid-permeable sheet  910 , the liquid-resistant sheet  920 , the outer sheet  930  and the leakproof sheet  800  with each other and to fix the leg stretchable elastic member  400 , the leakproof sheet stretchable elastic member  600  and the waist stretchable elastic member  500 . A hot-melt adhesive is preferably used as the adhesive, but other adhesives such as acrylic adhesive and rubber adhesive can also be used. 
     The adhesive is preferably applied in any one of spiral, wave, dot and stripe patterns. 
     Next, the relation between the contraction forces of the leg stretchable elastic member  400  and the waist stretchable elastic member  500  is described with reference to  FIGS. 15 and 16 . In  FIGS. 15 and 16 , for convenience of explanation, the abdomen-side flaps  150  and the back-side flaps  160  are not shown and only the body  140 B is shown. 
     As shown in  FIG. 15 , the leg stretchable elastic member  400  contracts inward from the ends in the diaper longitudinal direction Y. Specifically, contraction force F 1  of the leg stretchable elastic member  400  acts inward in the diaper longitudinal direction Y. 
     The waist stretchable elastic member  500  contracts inward from the ends in the diaper transverse direction X. Specifically, contraction force F 2  of the waist stretchable elastic member  500  acts inward in the diaper transverse direction X. 
     The contraction force intersecting region  180  is a region in which the contraction force F 1  of the leg stretchable elastic member  400  and the contraction force F 2  of the waist stretchable elastic member  500  intersect with each other. Therefore, contraction force F 3  of the contraction force intersecting region  180  acts inward in a direction crossing the diaper longitudinal direction Y and the diaper transverse direction X. 
     The contraction force intersecting region  180  includes a first contraction force intersecting region  181  formed toward the abdomen-side end  110 A of the disposable pet diaper  10  and a second contraction force intersecting region  182  formed toward the back-side end  130 A. 
     As a result, as shown in  FIG. 16 , a first curved part  540  is formed in the abdomen-side end  110 A and the back-side end  130 A of the disposable pet diaper  10  and bulges outward in a direction from the inside surface  100 Z 1  to the outside surface  100 Z 2  of the disposable pet diaper  10  by the contraction force F 2  of the waist stretchable elastic member  500 . 
     The first curved part  540  includes a first abdomen-side curved part  541  formed in the abdomen-side end  110 A of the disposable pet diaper  10  and a first back-side curved part  542  formed in the back-side end  130 A of the disposable pet diaper  10 . 
     Further, a second curved part  183  is formed in the contraction force intersecting region  180  and curved in the direction of the inside surface  100 Z 1  of the disposable pet diaper  10  by the contraction force F 3  acting on the contraction force intersecting region  180 . 
     The second curved part  183  includes a second abdomen-side curved part  184  formed in the first contraction force intersecting region  181  and a second back-side curved part  185  formed in the second contraction force intersecting region  182 . 
     Now, the state in which the leg stretchable elastic member  400  and the leakproof sheet stretchable elastic member  600  are contracted is described with reference to  FIG. 17 .  FIG. 17  is a sectional view taken along line D-D in  FIG. 1 , but, for convenience of explanation, part of the liquid-permeable sheet  910 , the liquid-resistant sheet  920  and the outer sheet  930  and the whole of the absorbent core  200  and the fastening region  900  are not shown. 
     In  FIG. 17 , the leg stretchable elastic member  400  and the leakproof sheet stretchable elastic member  600  are contracted. As a result, the erected section  700  is formed by the contraction forces of the leg stretchable elastic member  400  and the leakproof sheet stretchable elastic member  600 . Specifically, each of the abdomen-side erected region  171 , the back-side erected region  172  and the crotch-side erected region  173  in the absorbent-core non-arrangement region  170  is erected and forms the erected section  700 . 
     The erected section  700  includes an abdomen-side erected section  710 , a back-side erected section  720  and a crotch-side erected section  730 . 
     The abdomen-side erected region  171  is erected by contraction of the leg stretchable elastic member  400  and forms the abdomen-side erected section  710 . 
     The end of the leg stretchable elastic member  400  is arranged closer to the abdomen-side end  110 A of the disposable pet diaper  10  than the end of the leakproof sheet stretchable elastic member  600 . Therefore, the abdomen-side erected section  710  more strongly receives the influence of the contraction force of the leg stretchable elastic member  400  than the influence of the contraction force of the leakproof sheet stretchable elastic member  600 . Specifically, the abdomen-side fixing part  620  of the contraction force fixing part  610  is moved by the contraction force of the leakproof sheet stretchable elastic member  600 , which causes erection of the abdomen-side erected region  171 . Therefore, the leakproof sheet stretchable elastic member  600  also forms the abdomen-side erected section  710 . 
     Further, in this invention, as used herein, the term “erect” to form the erected section  700  means that the absorbent-core non-arrangement region  170  deforms by the contraction force of one of the stretchable elastic members or by a combination of the contraction forces of two or more of the stretchable elastic members. 
     The back-side erected region  172  is erected by contraction of the leg stretchable elastic member  400  and forms the back-side erected section  720 . 
     The leg stretchable elastic member  400  is overlapped with the waist stretchable elastic member  500 . Specifically, the both ends of the leg stretchable elastic member  400  are overlapped with the abdomen-side waist stretchable elastic member  510  and the back-side waist stretchable elastic member  520 . 
     The waist stretchable elastic member  500  is arranged having a prescribed length in the diaper transverse direction. Therefore, the abdomen-side erected section  710  and the back-side erected section  720  erect the abdomen-side waist stretchable elastic member  510  and the back-side waist stretchable elastic member  520 , respectively. Thus, the abdomen-side erected region  171  and the back-side erected region  172  are held in the stable erected state. Specifically, the abdomen-side waist stretchable elastic member  510  and the back-side waist stretchable elastic member  520  are provided as an erection sheet  740  to ensure the erected state of the erected section  700 . 
     When the back-side fixing part  630  of the contraction force fixing part  610  is moved by contraction of the leakproof sheet stretchable elastic member  600 , the crotch-side erected region  173  is erected and forms the crotch-side erected section  730 . 
     Further, as described above, the leakproof wall  820  is formed by contraction of the leakproof sheet stretchable elastic member  600 . A space surrounded by the leakproof wall  820 , the abdomen-side erected section  710 , the crotch-side erected section  730  and the absorbent core (not shown in  FIG. 17 ) forms an excrement storage space  850 . 
     A third curved part  640  is formed in a region extending from the abdomen-side end  110 A to the tail insertion opening  190  in the disposable pet diaper  10  and bulges in a direction from the inside surface  100 Z 1  to the outside surface  100 Z 2  of the disposable pet diaper  10  by the contraction forces F 1  of the leg stretchable elastic member  400  and the leakproof sheet stretchable elastic member  600 . 
     A fourth curved part  420  is formed in a region extending from the tail insertion opening  190  to the back-side end  130 A in the disposable pet diaper  10  and bulges in a direction from the inside surface  100 Z 1  to the outside surface  100 Z 2  of the disposable pet diaper  10  mainly by the contraction force F 1  of the leg stretchable elastic member  400 . 
     Next, the operation of putting the disposable pet diaper  10  on a pet is explained with reference to  FIGS. 18 to 20 . First, a user takes the disposable pet diaper  10  out of a package. In most cases, in the package, the abdomen-side flaps  150  and the back-side flaps  160  of the disposable pet diaper  10  are folded inward, and the disposable pet diaper  10  itself is folded, for example, into two or three. 
     When using the disposable pet diaper  10 , the user unfolds the folded structure. At this time, the leg stretchable elastic member  400 , the waist stretchable elastic member  500  and the leakproof sheet stretchable elastic member  600  contract. As a result, the erected section  700  including the abdomen-side erected section  710 , the back-side erected section  720  and the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540 , the second curved part  183 , the third curved part  640  and the fourth curved part  420  are formed, and the leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are formed. The shape of the disposable pet diaper  10  is stabilized by contraction of the leg stretchable elastic member  400 , the waist stretchable elastic member  500  and the leakproof sheet stretchable elastic member  600 . 
     Next, the user inserts the tail of the pet α through the tail insertion opening  190  of the disposable pet diaper  10 . 
     Then the user covers the crotch and the abdomen of the pet α with the crotch area  120  and the abdomen-side waist area  110 , while the back-side waist area  130  is fitted closely to the back of the pet α. Then the free end  310  of the fastening part  300  is fastened to the fastening region  900 . Thus, the disposable pet diaper  10  is put on the pet α. 
     These matters related to putting the disposable pet diaper  10  on the pet α is an example embodiment that corresponds to the feature that “when the disposable diaper is put on the pet, the crotch area and the abdomen-side waist area cover a crotch and an abdomen of the pet, while the back-side waist area is closely fitted to a back of the pet, and the fastening part is fastened to the fastening region” according to this invention. 
     The state of the disposable pet diaper  10  in fitting the back-side waist area  130  to the back of the pet α is explained with reference to  FIG. 18 . 
     The first curved part  540  bulging outward in the direction of the diaper outside surface  100 Z 2  is already formed in the back-side end  130 A. Further, a region extending from the back-side end  130 A to the tail insertion opening  190  is maintained in a stable shape by the fourth curved part  420 . The back-side flap  160  is curved in the direction of the inside surface  100 Z 1  of the disposable pet diaper  10  together with the second contraction force intersecting region  182  by the second curved part  183 . 
     Thus, the user can easily place the back-side end  130 A along a curve of the back of the pet α. 
     Further, the back-side end  130 A has a low possibility of turning up. 
     The state of the disposable pet diaper  10  in covering the crotch and the abdomen of the pet α with the crotch area  120  and the abdomen-side waist area  110  and fastening the free end  310  of the fastening part  300  to the fastening region  900 , is explained with reference to  FIG. 19 . 
     The first curved part  540  bulging outward in the direction of the diaper outside surface  100 Z 2  is already formed in the abdomen-side end  110 A. Further, a region extending from the abdomen-side end  110 A to the tail insertion opening  190  is maintained in a stable shape by the third curved part  640 . 
     The abdomen-side flap  150  is curved together with the first contraction force intersecting region  181  in the direction of the inside surface  100 Z 1  of the disposable pet diaper  10  by the second curved part  183 . In the abdomen-side flap  150  having the fastening part  300 , the end  150 B in the transverse direction is heavier than a boundary part of the abdomen-side flap  150  with the body  140 B. Therefore, the boundary part of the abdomen-side flap  150  with the body  140 B is curved in the direction of the inside surface  100 Z 1  together with the second curved part  183 , while the end  150 B of the abdomen-side flap  150  in the transverse direction is curved in the direction of the outside surface  100 Z 2  by its own weight. As a result, the fastening part  300  is supported by the abdomen-side flap  150  without hanging straight down. 
     Thus, the user can easily set the abdomen-side end  110 A onto a curve of the abdomen of the pet α. 
     Further, the abdomen-side end  110 A has a low possibility of turning up. 
     Further, the user can easily grab the fastening part  300 . 
     Furthermore, when the user moves the fastening part  300  toward the fastening region  900 , the fastening part  300  receives the influence of the first contraction force intersecting region  181 . Therefore, wherever the user moves the fastening part  300 , the contraction force acts upon the fastening part  300 . As a result, the user can easily move the fastening part  300  onto a desired position of the fastening region  900 . 
       FIG. 20  is a drawing for illustrating the state of the disposable pet diaper  10  worn by the pet α. 
     Even after the disposable pet diaper  10  has been put on the pet, the leg stretchable elastic member  400 , the waist stretchable elastic member  500  and the leakproof sheet stretchable elastic member  600  are maintained in the contracted state. Therefore, the erected section  700  including the abdomen-side erected section  710 , the back-side erected section  720  and the crotch-side erected section  730  is maintained in the erected state. The leakproof wall  820  is also maintained. Further, the first curved part  540 , the second curved part  183 , the third curved part  640  and the fourth curved part  420  are maintained in the curved state. The leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are maintained. 
     When the pet α excretes, excrement is held within the excrement storage space  850 . When the excrement is urine, it is absorbed by the absorbent core  200 . When the excrement is feces, part of feces is absorbed by the absorbent core  200  and the rest is held within the excrement storage space  850 . 
     Whether the excrement is urine or feces, the weight of the absorbent core  200  is received in the fastening part longitudinal direction  300 X in the free part  310  of the fastening part  300 . 
     This is an example embodiment that corresponds to the feature that “the weight of the absorbent core after excretion is received in the longitudinal direction of the fastening part while the disposable diaper is worn by the pet” according to this invention. 
     In order to remove the disposable pet diaper  10  from the pet α, the fastening part  300  is detached from the fastening region  900 , and then the disposable pet diaper  10  is pulled off through the tail insertion opening  190  and disposed of. 
     In the process of detaching the fastening part  300  from the fastening region  900  and pulling off the disposable pet diaper  10  through the tail insertion opening  190 , the abdomen-side end  110 A is turned obliquely downward from the pet α. Even at this time, the risk of falling of feces can be reduced by the abdomen-side erected section  710 . 
     Second to twenty-ninth embodiments of the present invention are now described with reference to  FIGS. 21 to 50 . In the description of the second to twenty-ninth embodiments, components which are identical to those in the first embodiment are not described in detail and their reference numerals are omitted. 
     (Second Embodiment) 
     The second embodiment of the present invention is explained with reference to  FIG. 21 . A disposable pet diaper  11  according to the second embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  11 A is formed as a second extended identification region  11 A 1 . 
     Specifically, the identification region  11 A extends from the longitudinal end of the back-side flap  160  of the disposable pet diaper  11  in the diaper longitudinal direction. 
     By providing the identification region  11 A as the second extended identification region  11 A 1 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  11  is put on a pet. Specifically, if the second extended identification region  11 A 1  is visible when the disposable pet diaper  11  is put on a pet, it is identified that the back-side flap  160  is not creased. On the other hand, if the second extended identification region  11 A 1  is not visible or is creased, it is identified that the back-side flap  160  is creased. 
     (Third Embodiment) 
     The third embodiment of the present invention is explained with reference to  FIG. 22 . A disposable pet diaper  12  according to the third embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  12 A is formed as a colored identification region  12 A 1  which is differently colored from the other region of the back-side flap  160 . 
     By providing the identification region  12 A as the colored identification region  12 A 1 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  12  is put on a pet. Specifically, if the colored identification region  12 A 1  is visible when the disposable pet diaper  12  is put on a pet, it is identified that the back-side flap  160  is not creased. On the other hand, if the colored identification region  12 A 1  is not visible or is creased, it is identified that the back-side flap  160  is creased. 
     (Fourth Embodiment) 
     The fourth embodiment of the present invention is explained with reference to  FIG. 23 . A disposable pet diaper  13  according to the fourth embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  13 A is formed in the abdomen-side flap  150 . 
     The identification region  13 A formed in the abdomen-side flap  150  forms a visible region  13 A 1  for checking the state of the back-side flap  160 . 
     In the fourth embodiment, the visible region  13 A 1  is formed by a light transmissive identification region  13 A 2  which is capable of transmitting light. 
     Specifically, the light transmissive identification region  13 A 2  is obtained by forming the abdomen-side flap  150  of a known nonwoven fabric or film which is capable of transmitting light. It needs to have a light transmitting capability enough to make the back-side flap  160  visible through the abdomen-side flap  150  when the abdomen-side flap  150  is put on the back-side flap  160 . 
     By providing the identification region  13 A as the visible region  13 A 1  in the form of the light transmissive identification region  13 A 2 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  13  is put on a pet. Specifically, the state of the back-side flap  160  can be visually checked through the light transmissive identification region  13 A 2  when the disposable pet diaper  13  is put on a pet. 
     (Fifth Embodiment) 
     The fifth embodiment of the present invention is explained with reference to  FIG. 24 . A disposable pet diaper  14  according to the fifth embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  14 A in the form of a visible region  14 A 1  is formed by a cutout identification region  14 A 2  that is formed by cutting out an abdomen-side end portion of the abdomen-side flap  150 . 
     By providing the identification region  14 A as the visible region  14 A 1  in the form of the cutout identification region  14 A 2 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  14  is put on a pet. Specifically, the state of the back-side flap  160  can be visually checked through the cutout identification region  14 A 2  when the disposable pet diaper  14  is put on a pet. 
     (Sixth Embodiment) 
     The sixth embodiment of the present invention is explained with reference to  FIG. 25 . A disposable pet diaper  15  according to the sixth embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  15 A in the form of a visible region  15 A 1  is formed by a first open identification region  15 A 2  that is formed by providing an opening in the abdomen-side flap  160 . 
     By providing the identification region  15 A as the visible region  15 A 1  in the form of the first open identification region  15 A 2 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  15  is put on a pet. Specifically, the state of the back-side flap  160  can be visually checked through the first open identification region  15 A 2  when the disposable pet diaper  15  is put on a pet. 
     (Seventh Embodiment) 
     The seventh embodiment of the present invention is explained with reference to  FIG. 26 . A disposable pet diaper  16  according to the seventh embodiment is different from the disposable pet diaper  10  of the first embodiment in that an identification region  16 A in the form of a visible region  16 A 1  has a second open identification region  16 A 2  formed by an opening in the abdomen-side flap  150 , and a cover region  16 A 22  that is configured to cover the second open identification region  16 A 2  and to be freely opened and closed with respect to the second open identification region  16 A 2 . 
     The second open identification region  16 A 2  is formed by an opening  16 A 21  in the abdomen-side flap  150 . 
     The cover region  16 A 22  has a first cover part  16 A 221  and a second cover part  16 A 223 . The first cover part  16 A 221  and the second cover part  16 A 223  are arranged side by side so as to cover the opening  16 A 21 . The first cover part  16 A 221  and the second cover part  16 A 223  are opposed to each other at the center of the opening  16 A 21 . Ends of the first cover part  16 A 221  other than the end opposed to the second cover part  16 A 223  form a first bonded part  16 A 222  connected to the outer sheet by an adhesive. Ends of the second cover part  16 A 223  other than the end opposed to the first cover part  16 A 221  form a second bonded part  16 A 224  connected to the outer sheet by an adhesive. 
     By providing the identification region  16 A as the visible region  16 A 1  in the form of the second open identification region  16 A 2  and the cover region  16 A 22 , whether the back-side flap  160  is creased or not can be confirmed when the disposable pet diaper  16  is put on a pet. Specifically, when the disposable pet diaper  16  is put on a pet, as shown in  FIG. 27 , the second open identification region  16 A 2  can be exposed by press-opening the first cover part  16 A 221  and the second cover part  16 A 223 . Therefore, the state of the back-side flap  160  can be visually checked through the second open identification region  16 A 2 . 
     Various structures of the identification regions are described above by means of the first to seventh embodiments of the present invention, but the structures of the identification regions of the present invention are not limited to those as described above. 
     The identification region may be formed by a back-side flap identification region formed in the back-side flap and an abdomen-side flap identification region formed in the abdomen-side flap. 
     (Eighth Embodiment) 
     The eighth embodiment of the present invention is explained with reference to  FIG. 28 . In a disposable pet diaper  17  according to the eighth embodiment, a lateral end  161 B of a back-side flap  161  is formed to have a shape that gradually changes in the diaper longitudinal direction. This shape of the lateral end  161 B is defined by a straight line. 
     A maximum width region  161 B 1  of the lateral end  161 B is formed by an intersecting part between a first straight part  161 BA and a second straight part  161 BB. Therefore, the maximum width region  161 B  1  intersects at a point with a virtual line extending in the diaper longitudinal direction. 
     The disposable pet diaper  17  constructed as described above according to the eighth embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (Ninth Embodiment) 
     The ninth embodiment of the present invention is explained with reference to  FIG. 29 . In a disposable pet diaper  18  according to the ninth embodiment, a lateral end  162 B of a back-side flap  162  has a region having a shape that gradually changes in the diaper longitudinal direction and a region extending parallel to the diaper longitudinal direction. 
     The region of the lateral end  162 B of the back-side flap  162  having a shape that gradually changes in the diaper longitudinal direction, is defined by a generally circular arc curve. The generally circular arc curve has a first circular arc part  162 BA and a second circular arc part  162 BC. 
     The lateral end  162 B of the back-side flap  162  further has a straight part  162 BB which defines a maximum width region  162 B 1  having a maximum width. 
     The disposable pet diaper  18  constructed as described above according to the ninth embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (Tenth Embodiment) 
     The tenth embodiment of the present invention is explained with reference to  FIG. 30 . In a disposable pet diaper  19  according to the tenth embodiment, a lateral end  163 B of a back-side flap  163  has a region having a shape that gradually changes in the diaper longitudinal direction and a region extending parallel to the diaper longitudinal direction. 
     The region of the lateral end  163 B of the back-side flap  163  having a shape that gradually changes in the diaper longitudinal direction, is defined by a straight line. This straight line has a first straight part  163 BA and a second straight part  163 BC. 
     The lateral end  163 B of the back-side flap  163  further has a third straight part  163 BB which defines a maximum width region  163 B 1  having a maximum width. 
     The disposable pet diaper  19  constructed as described above according to the tenth embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (Eleventh Embodiment) 
     The eleventh embodiment of the present invention is explained with reference to  FIG. 31 . In a disposable pet diaper  20  according to the eleventh embodiment, a lateral end  901 BB of a second fastening region  901 B has a shape that gradually changes in the diaper longitudinal direction. 
     The lateral end  901 BB of the second fastening region  901 B has a generally circular arc shape. 
     The disposable pet diaper  20  constructed as described above according to the eleventh embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (Twelfth Embodiment) 
     The twelfth embodiment of the present invention is explained with reference to  FIG. 32 . In a disposable pet diaper  21  according to the twelfth embodiment, a lateral end  902 BB of a second fastening region  902 B has a shape that gradually changes in the diaper longitudinal direction. 
     The lateral end  902 BB of the second fastening region  902 B has a linear shape. Specifically, the lateral end  902 BB has a first straight part  902 BB 1  and a second straight part  902 BB 2 . 
     The disposable pet diaper  21  constructed as described above according to the twelfth embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (13th Embodiment) 
     The 13th embodiment of the present invention is explained with reference to  FIG. 33 . In a disposable pet diaper  22  according to the 13th embodiment, a back-side flap  164  has a longer length in the diaper transverse direction than an abdomen-side flap  151 . 
     The disposable pet diaper  22  constructed as described above according to the 13th embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (14th Embodiment) 
     The 14th embodiment of the present invention is explained with reference to  FIG. 34 . In a disposable pet diaper  23  according to the 14th embodiment, only a first fastening region  901 A is provided as a fastening region  901  over the whole outside surface  100 Z 2  of the disposable pet diaper  23 . 
     The disposable pet diaper  23  constructed as described above according to the 14th embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (15th Embodiment) 
     The 15th embodiment of the present invention is explained with reference to  FIG. 35 . In a disposable pet diaper  24  according to the 15th embodiment, a first fastening region  902 A is provided as a fastening region  902  on the outside surface  100 Z 2  extending over the diaper body within the back-side waist area and the back-side flaps. 
     In the other part of the outside surface  100 Z 2  which does not have the first fastening region  902 A, nonwoven fabric which does not have a force of engagement with the hook part of the fastening part can be used. 
     The disposable pet diaper  24  constructed as described above according to the 15th embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (16th Embodiment) 
     The 16th embodiment of the present invention is explained with reference to  FIG. 36 . In a disposable pet diaper  25  according to the 16th embodiment, a first fastening region  903 A is provided as a fastening region  903  on the outside surface  100 Z 2  of the diaper body within the back-side waist area. 
     In the outside surface of the back-side flap which does not have the first fastening region  903 A, nonwoven fabric which does not have a force of engagement with the hook part of the fastening part can be used. 
     The disposable pet diaper  25  constructed as described above according to the 16th embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     (17th Embodiment) 
     The 17th embodiment of the present invention is explained with reference to  FIGS. 37 and 38 . In a disposable pet diaper  26  according to the 17th embodiment, a third welded part  931 C is formed by third welded short lines  931  C 2  which are continuously arranged with intervals in a first fastening region  904 A of a fastening region  904 . 
     The relation between a pair of the third welded short lines  931 C 2  in a third adjacent welded part group  931 CB in such a case in which the third welded part  931 C is formed by the third welded short lines  931  C 2  is now explained. 
     First, lines passing each end of the third welded short lines  931 C 2  and running perpendicularly to the third direction are referred to as virtual lines  931 CBL. 
     In one of a pair of the adjacent third welded parts  931 C of the third adjacent welded part group  931 CB, the third welded short line  931 C 2  is located between the virtual lines  931 CBL, while, in the other third welded part  931 C, a space between the third welded short lines  931 C 2  exists between the virtual lines  931 CBL. This relation is defined as the relation that “the welded short lines in the adjacent welded part group do not overlap with each other”. 
     In such a case in which the third welded part  931 C is formed by the third welded short lines  931 C 2 , other arrangement of a pair of the third welded parts  931 C forming the third adjacent welded part group  931 CB is now considered. 
     In the third adjacent welded part group  931 CB, a pair of the third welded short lines  931 C 2  may exist in a direction perpendicular to the third direction. This relation is defined as the relation that “the welded short lines in the adjacent welded part group overlap with each other”. 
     The relation that “the welded short lines in the adjacent welded part group overlap with each other” and the relation that “the welded short lines in the adjacent welded part group do not overlap with each other” may also be provided in the first and second welded parts. Specifically, these relations of “the welded short lines in the adjacent welded part group” can be appropriately selected depending on the structure of the loop parts to be obtained. 
     A surrounding part  931 D of the disposable pet diaper  26  according to the 17th embodiment is now described with reference to  FIG. 38 . 
     The surrounding part  931 D is defined by a first welded part  931 A in the form of a first continuous line  931 A 1  and a second welded part  931 B in the form of a second continuous line  931 B 1 . 
     In the surrounding part  931 D, a first loop part  931 L 1  and a second loop part  931 L 2  are formed. 
     Further, by providing the third welded part  931 C as the third welded short lines  931  C 2 , a third loop part  931 L 3  is formed of thermoplastic fibers extending from the first welded part  931 A to the second welded part  931 B through a space between the third welded short lines  931 C 2  of the third welded part  931 C and can be removably engaged with the hook part of the fastening part. 
     Further, a fourth loop part  931 L 4  is formed of thermoplastic fibers extending from one of the first welded parts  931 A of a first adjacent welded part group  931  AB to the other first welded part  931 A through a space between the third welded short lines  931 C 2  of the third welded part  931 C and can be removably engaged with the hook part of the fastening part. 
     Further, a fifth loop part  931 L 5  is formed of thermoplastic fibers extending from one of the second welded parts  931 B of a second adjacent welded part group  931 BB to the other second welded part  931 B through a space between the third welded short lines  931 C 2  of the third welded part  931 C and can be removably engaged with the hook part of the fastening part. 
     The disposable pet diaper  26  constructed as described above according to the 17th embodiment is suitable for use with a hook part having a different structure from that of the disposable pet diaper  10  of the first embodiment. 
     (18th Embodiment) 
     The 18th embodiment of the present invention is explained with reference to  FIG. 39 . In a disposable pet diaper  27  according to the 18th embodiment, a first welded part  932 A, a second welded part  932 B and a third welded part  932 C are formed as first welded short lines  932 A 2 , second welded short lines  932 B 2  and third welded short lines  932 C 2 , respectively, in a first fastening region  905 A of a fastening region  905 . 
     By provision of this structure, in addition to the first to fifth loop parts, a sixth loop part can be formed by thermoplastic fibers extending over the adjacent surrounding parts  932 D and can be removably engaged with the hook part of the fastening part. 
     Further, the first welded short lines  932 A 2  of a first adjacent welded part group  932 AB overlap with each other, and the second welded short lines  932 B 2  of a second adjacent welded part group  932 BB overlap with each other. 
     The disposable pet diaper  27  constructed as described above according to the 18th embodiment is suitable for use with a hook part having a different structure from that of the disposable pet diaper  10  of the first embodiment. 
     (19th Embodiment) 
     The 19th embodiment of the present invention is explained with reference to  FIG. 40 . In a disposable pet diaper  28  according to the 19th embodiment, a first welded part  933 A, a second welded part  933 B and a third welded part  933 C are formed as first welded short lines  933 A 2 , second welded short lines  933 B 2  and third welded short lines  933 C 2 , respectively, in a first fastening region  906 A of a fastening region  906 . 
     The third welded short lines  933 C 2  are provided to extend over the adjacent surrounding parts  932 D. 
     By provision of this structure, the first to sixth loop parts having different lengths from those of the above-described first, 17th and 18th embodiments can be formed. 
     The disposable pet diaper  28  constructed as described above according to the 19th embodiment is suitable for use with a hook part having a different structure from that of the disposable pet diaper  10  of the first embodiment. 
     (20th Embodiment) 
     The 20th embodiment of the present invention is explained with reference to  FIG. 41 . In a disposable pet diaper  29  according to the 20th embodiment, a first welded part  934 A, a second welded part  934 B and a third welded part  934 C are formed as first welded short lines  934 A 2 , second welded short lines  934 B 2  and third welded short lines  934 C 2 , respectively, in a first fastening region  907 A of a fastening region  907 . 
     Further, the first welded part  934 A is formed by two parallel first welded parts  934 A, and the second welded part  934 B is formed by two parallel second welded parts  934 B. 
     By provision of this structure, the first to sixth loop parts having different lengths from those of the above-described first and 17th to 19th embodiments can be formed. 
     The disposable pet diaper  29  constructed as described above according to the 20th embodiment is suitable for use with a hook part having a different structure from that of the disposable pet diaper  10  of the first embodiment. 
     (21st Embodiment) 
     The 21st embodiment of the present invention is explained with reference to  FIG. 42 . A disposable pet diaper  30  according to the 21st embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  401  includes a plurality of leg stretchable elastic members. Specifically, the leg stretchable elastic member  401  of the 21st embodiment is configured by continuously arranging a plurality of leg stretchable elastic members with intervals in the diaper longitudinal direction. The number of the continuously arranged leg stretchable elastic members can be appropriately selected according to the disposable pet diaper to be realized. 
     In the 21st embodiment of this invention, the leg stretchable elastic member  401  extending continuously in the diaper longitudinal direction includes three leg stretchable elastic members, or a leg stretchable elastic member  401 A in the abdomen-side waist area, a leg stretchable elastic member  401 B in the crotch area, and a leg stretchable elastic member  401 C in the back-side waist area. 
     Like in the first embodiment, in the 21st embodiment, the erected section  700  including the abdomen-side erected section  710 , the back-side erected section  720  and the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540  including the first abdomen-side curved part  541  and the first back-side curved part  542 , the second curved part  183  including the second abdomen-side curved part  184  and the second back-side curved part  185 , the third curved part  640  and the fourth curved part  420  are formed. Further, the leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are formed. 
     Therefore, the disposable pet diaper  30  according to the 21st embodiment has the same effect as the disposable pet diaper  10  of the first embodiment. 
     Furthermore, by provision of the leg stretchable elastic member  401  including the three leg stretchable elastic members, the stretching forces of the leg stretchable elastic members can be prevented from affecting each other. Therefore, for example, the back-side waist area is little affected by displacement (or slippage) of the abdomen-side waist area, if any, so that displacement can be prevented as a whole. 
     (22nd Embodiment) 
     The 22nd embodiment of the present invention is explained with reference to  FIG. 43 . A disposable pet diaper  31  according to the 22nd embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  402  is not continuously arranged in the diaper longitudinal direction. 
     Specifically, in the 22nd embodiment of this invention, the leg stretchable elastic member  402  includes a leg stretchable elastic member  402 A disposed in the abdomen-side waist area of the disposable pet diaper  31  and a leg stretchable elastic member  402 B disposed in the back-side waist area. 
     The 22nd embodiment is different from the first embodiment in that the leg gathers  410  and the fourth curved part  420  are formed only in the regions of the leg stretchable elastic members  402 A and  402 B in the disposable pet diaper  31 . 
     In this structure, the erected section  700  including the abdomen-side erected section  710 , the back-side erected section  720  and the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540  including the first abdomen-side curved part  541  and the first back-side curved part  542 , the second curved part  183  including the second abdomen-side curved part  184  and the second back-side curved part  185 , the third curved part  640  and part of the fourth curved part  420  are formed. Further, part of the leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are formed. 
     Therefore, the disposable pet diaper  31  according to the 22nd embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the whole leg gathers  410  and the whole fourth curved part  420 . 
     Furthermore, in this structure, the stretchable elastic member is not provided in the crotch area in which the absorbent core is disposed, and nor in the free end of the leakproof gathers. Therefore, the absorbent core does not shrink, so that the area of the absorbent core can be effectively used. 
     Further, a pocket space can be readily formed in both end regions of the absorbent core in the diaper longitudinal direction. 
     Moreover, the stretchable elastic member is not provided in the fastening region. Therefore, the fastening region does not shrink, so that the fastening part can be easily engaged with the fastening region. 
     (23rd Embodiment) 
     The 23rd embodiment of the present invention is explained with reference to  FIG. 44 . A disposable pet diaper  32  according to the 23rd embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  403  is not provided in the back-side waist area. Further, the contraction force of the leakproof sheet stretchable elastic member exerts no influence on the abdomen-side end of the disposable pet diaper  32 . 
     Compared with the disposable pet diaper  10  of the first embodiment, the disposable pet diaper  32  of the 23rd embodiment is different in that the leg gathers  410  and the fourth curved part  420  are formed only in the region of the leg stretchable elastic member  403 . Further, the back-side erected section  720  of the erected section  700  and the second back-side curved part  185  of the second curved part  183  are not formed. 
     In this structure, the erected section  700  including the abdomen-side erected section  710  and the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540  including the first abdomen-side curved part  541  and the first back-side curved part  542 , the second curved part  183  including the second abdomen-side curved part  184 , the third curved part  640  and part of the fourth curved part  420  are formed. Further, part of the leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are formed. 
     Therefore, the disposable pet diaper  32  according to the 23rd embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the whole leg gathers  410 , the back-side erected section  720 , the second back-side curved part  185  and the whole fourth curved part  420 . 
     Further, a pocket space can be readily formed in back-side and abdomen-side end regions of the absorbent core. 
     (24th Embodiment) 
     The 24th embodiment of the present invention is explained with reference to  FIG. 45 . A disposable pet diaper  33  according to the 24th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  404  is not provided in the abdomen-side waist area. Further, the contraction force of the leakproof sheet stretchable elastic member exerts no influence on the back-side end of the disposable pet diaper  33 . 
     Compared with the disposable pet diaper  10  of the first embodiment, the disposable pet diaper  33  of the 24th embodiment is different in that the leg gathers  410  are formed only in the region of the leg stretchable elastic member  404 . Further, the abdomen-side erected section  710  of the erected section  700  and the second abdomen-side curved part  184  of the second curved part  183  are not formed. 
     In this structure, the erected section  700  including the back-side erected section  720  and the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540  including the first abdomen-side curved part  541  and the first back-side curved part  542 , the second curved part  183  including the second back-side curved part  185 , the third curved part  640  and the fourth curved part  420  are formed. Further, part of the leg gathers  410 , the waist gathers  530  and the leakproof gathers  840  are formed. 
     Therefore, the disposable pet diaper  33  according to the 24th embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the whole leg gathers  410 , the abdomen-side erected section  710  and the second abdomen-side curved part  184 . 
     Further, the absorbent core is not subjected to a contraction force, so that the area of the absorbent core can be effectively used. 
     Moreover, by provision of the leg stretchable elastic member only in the back-side area, it is made easier to fit the disposable pet diaper along the back of the pet. As a result, the fastening part can be easily engaged with the fastening region. 
     (25th Embodiment) 
     The 25th embodiment of the present invention is explained with reference to  FIG. 46 . A disposable pet diaper  34  according to the 25th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member is not provided, and a leakproof sheet stretchable elastic member  601  is arranged to extend from the abdomen-side end to the back-side end of the disposable pet diaper  34 . The abdomen-side fixing part and the back-side fixing part are formed in the abdomen-side end and the back-side end of the disposable pet diaper  34 , respectively, in the fixed part of the leakproof sheet. The leakproof sheet stretchable elastic member  601  is overlapped with the abdomen-side waist stretchable elastic member and the back-side waist stretchable elastic member of the waist stretchable elastic member. 
     A comparison is made between the disposable pet diaper  10  of the first embodiment and the disposable pet diaper  34  of the 25th embodiment. In the disposable pet diaper  34  of the 25th embodiment, the erected section  700  including the abdomen-side erected section  710  and the back-side erected section  720 , the leakproof wall  820 , the leakproof gathers  840 , the third curved part  640  and the fourth curved part  420  are formed by the action of the leakproof sheet stretchable elastic member  601 . 
     The first abdomen-side curved part  541  and the first back-side curved part  542  are formed by the action of the waist stretchable elastic member, or by the actions of the abdomen-side waist stretchable elastic member and the back-side waist stretchable elastic member, respectively. 
     The first contraction force intersecting region  181  is formed by the contraction force of the leakproof sheet stretchable elastic member  601  and the contraction force of the abdomen-side waist stretchable elastic member. As a result, the second abdomen-side curved part  184  is formed. 
     Further, the second contraction force intersecting region  182  is formed by the contraction force of the leakproof sheet stretchable elastic member  601  and the contraction force of the back-side waist stretchable elastic member. As a result, the second back-side curved part  185  is formed. 
     Specifically, in the disposable pet diaper  34  of the 25th embodiment, unlike in the disposable pet diaper  10  of the first embodiment, the crotch-side erected section  730  and the leg gathers  410  are not formed. 
     Therefore, the disposable pet diaper  34  of the 25th embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the leg gathers  410  and the crotch-side erected section  730 . 
     Furthermore, in the disposable pet diaper  34  of the 25th embodiment, due to the absence of a leg stretchable elastic member, the ends of the disposable pet diaper  34  in the transverse direction can be located closer to the absorbent core. As a result, a portion of the disposable pet diaper  34  which comes in contact with the pet&#39;s legs can be further reduced. 
     Further, due to the absence of a sheet forming a portion around legs, the disposable pet diaper can be made neat around legs when worn. 
     (26th Embodiment) 
     The 26th embodiment of the present invention is explained with reference to  FIG. 47 . A disposable pet diaper  35  according to the 26th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  405  is not provided in the abdomen-side waist area and the back-side waist area. Further, the contraction force of the leakproof sheet stretchable elastic member exerts no influence on the abdomen-side end of the disposable pet diaper  35 . Further, an abdomen-side waist stretchable elastic member  511  is overlapped with fastening parts  301 . The feature that “an abdomen-side waist stretchable elastic member is overlapped with fastening parts” according to this invention does not mean that the abdomen-side waist stretchable elastic member is in direct contact with the fastening parts. Specifically, it means that the contraction force of the abdomen-side waist stretchable elastic member does not act on the fastening parts via flaps, but it directly act on them. 
     A comparison is made between the disposable pet diaper  10  of the first embodiment and the disposable pet diaper  35  of the 26th embodiment. In the disposable pet diaper  35  of the 26th embodiment, the leg gathers  410  are formed only in a region of a leg stretchable elastic member  405 . Further, the abdomen-side erected section  710  and the back-side erected section  720  of the erected section  700  are not formed. The second abdomen-side curved part  184  and the second back-side curved part  185  of the second curved part  183  are not formed. The fourth curved part  420  is formed only in the region of the leg stretchable elastic member  405 . 
     In this structure, the erected section  700  including the crotch-side erected section  730  is formed, and the leakproof wall  820  is formed. Further, the first curved part  540  including the first abdomen-side curved part  541  and the first back-side curved part  542 , the third curved part  640  and part of the fourth curved part  420  are formed. Part of the leg gathers  410  and the leakproof gathers  840  are formed. 
     Therefore, the disposable pet diaper  35  according to the 26th embodiment has those of the effects of the disposable pet diaper  10  of the first embodiment which are exhibited by the crotch-side erected section  730 , the leakproof wall  820 , the first abdomen-side curved part  541  and the first back-side curved part  542 , the third curved part  640 , part of the fourth curved part  420 , part of the leg gathers  410  and the leakproof gathers  840 . 
     Furthermore, by arrangement of the abdomen-side waist stretchable elastic member  511  overlapped with the fastening parts  301 , when the abdomen-side waist area is set on the abdomen of the pet in order to put the disposable pet diaper  35  on the pet, the fastening parts  301  are curved inside the disposable pet diaper under the influence of the contraction force of the abdomen-side waist stretchable elastic member  511 . Thus, it is made easier for the user to grab the fastening parts  301 . 
     (27th Embodiment) 
     The 27th embodiment of the present invention is explained with reference to  FIG. 48 . A disposable pet diaper  36  according to the 27th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  406  is not provided in the abdomen-side waist area and the back-side waist area of the disposable pet diaper  36 , and a leakproof sheet stretchable elastic member  603  is arranged to extend from the abdomen-side end to the back-side end of the disposable pet diaper  36 . The abdomen-side fixing part and the back-side fixing part are formed in the abdomen-side end and the back-side end of the disposable pet diaper  36 , respectively, in the fixed part of the leakproof sheet. The leakproof sheet stretchable elastic member  603  is overlapped with an abdomen-side waist stretchable elastic member  512  and the back-side waist stretchable elastic member of the waist stretchable elastic member. The abdomen-side waist stretchable elastic member  512  is overlapped with the fastening parts  302 . 
     A comparison is made between the disposable pet diaper  10  of the first embodiment and the disposable pet diaper  36  of the 27th embodiment. In the disposable pet diaper  36  of the 27th embodiment, the erected section  700  including the abdomen-side erected section  710  and the back-side erected section  720 , the leakproof wall  820 , the leakproof gathers  840 , the third curved part  640  and the fourth curved part  420  are formed by the action of the leakproof sheet stretchable elastic member  603 . 
     The first abdomen-side curved part  541  and the first back-side curved part  542  are formed by the action of the waist stretchable elastic member, or by the actions of the abdomen-side waist stretchable elastic member  512  and the back-side waist stretchable elastic member, respectively. 
     The first contraction force intersecting region  181  is formed by the contraction force of the leakproof sheet stretchable elastic member  603  and the contraction force of the abdomen-side waist stretchable elastic member. As a result, the second abdomen-side curved part  184  is formed. 
     Further, the second contraction force intersecting region  182  is formed by the contraction force of the leakproof sheet stretchable elastic member  603  and the contraction force of the back-side waist stretchable elastic member. As a result, the second back-side curved part  185  is formed. 
     Specifically, in the disposable pet diaper  36  of the 27th embodiment, unlike in the disposable pet diaper  10  of the first embodiment, the crotch-side erected section  730  and part of the leg gathers  410  are not formed. 
     Therefore, the disposable pet diaper  36  of the 27th embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the whole leg gathers  410  and the crotch-side erected section  730 . 
     Furthermore, due to the absence of the leg stretchable elastic member in the abdomen-side region and the back-side region, the abdomen-side region and the back-side region can be fitted around the waist of the pet while the fastening member is engaged. 
     Further, a pocket can be formed in both end regions of the absorbent core in the diaper longitudinal direction. 
     Furthermore, by provision of the abdomen-side waist stretchable elastic member  512  overlapped with the fastening parts  302 , when the abdomen-side waist area is set on the abdomen of the pet in order to put the disposable pet diaper  36  on the pet, the fastening parts  302  are curved inside the disposable pet diaper under the influence of the contraction force of the abdomen-side waist stretchable elastic member  512 . Thus, it is made easier for the user to grab the fastening parts  302 . 
     (28th Embodiment) 
     The 28th embodiment of the present invention is explained with reference to  FIG. 49 . A disposable pet diaper  37  according to the 28th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leakproof sheet stretchable elastic member  604  is arranged to extend from the abdomen-side end to the back-side end of the disposable pet diaper  37 . The abdomen-side fixing part and the back-side fixing part are formed in the abdomen-side end and the back-side end of the disposable pet diaper  37 , respectively, in the fixed part of the leakproof sheet. The leakproof sheet stretchable elastic member  604  is overlapped with an abdomen-side waist stretchable elastic member  513  and the back-side waist stretchable elastic member of the waist stretchable elastic member. Further, the abdomen-side waist stretchable elastic member  513  is overlapped with fastening parts  303 . 
     A comparison is made between the disposable pet diaper  10  of the first embodiment and the disposable pet diaper  37  of the 28th embodiment. In the disposable pet diaper  37  of the 28th embodiment, the erected section  700  including the abdomen-side erected section  710  and the back-side erected section  720 , the leg gathers  410 , the leakproof wall  820 , the leakproof gathers  840 , the third curved part  640  and the fourth curved part  420  are formed by the actions of a leg stretchable elastic member  407  and the leakproof sheet stretchable elastic member  604 . 
     The first abdomen-side curved part  541  and the first back-side curved part  542  are formed by the action of the waist stretchable elastic member, or by the actions of the abdomen-side waist stretchable elastic member  513  and the back-side waist stretchable elastic member, respectively. 
     Two structures of the first contraction force intersecting regions  181  are formed. One is formed by intersection of the contraction forces of the leg stretchable elastic member  407  and the abdomen-side waist stretchable elastic member  513 , and the other is formed by the contraction force of the leakproof sheet stretchable elastic member  604  and the contraction force of the abdomen-side waist stretchable elastic member  513 . Accordingly, two structures of the second abdomen-side curved parts  184  are formed by formation of the two structures of the first contraction force intersecting regions  181 . 
     Similarly, two structures of the second contraction force intersecting regions  182  are formed. One is formed by intersection of the contraction forces of the leg stretchable elastic member  407  and the back-side waist stretchable elastic member, and the other is formed by the contraction force of the leakproof sheet stretchable elastic member  604  and the contraction force of the back-side waist stretchable elastic member. Accordingly, two structures of the second back-side curved parts  185  are formed by formation of the two structures of the second contraction force intersecting regions  182 . 
     Specifically, unlike in the disposable pet diaper  10  of the first embodiment, the crotch-side erected section  730  is not formed in the disposable pet diaper  37  of the 28th embodiment. 
     Therefore, the disposable pet diaper  37  of the 28th embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the crotch-side erected section  730 . 
     Furthermore, by provision of the abdomen-side waist stretchable elastic member  513  overlapped with the fastening parts  303 , when the abdomen-side waist area is set on the abdomen of the pet in order to put the disposable pet diaper  37  on the pet, the fastening parts  303  are curved inside the disposable pet diaper under the influence of the contraction force of the abdomen-side waist stretchable elastic member  513 . Thus, it is made easier for the user to grab the fastening parts  303 . 
     Further, the contraction forces act over the whole diaper in the diaper longitudinal direction, so that leakage of excrement can be prevented. Therefore, this disposable pet diaper is particularly suitable for bedridden pets. 
     (29th Embodiment) 
     The 29th embodiment of the present invention is explained with reference to  FIG. 50 . A disposable pet diaper  38  according to the 29th embodiment is different from the disposable pet diaper  10  of the first embodiment in that a leg stretchable elastic member  408  is not provided in the back-side waist area. Further, a leakproof sheet stretchable elastic member  605  is arranged to extend up to the abdomen-side end of the disposable pet diaper  38 . The abdomen-side fixing part is formed in the abdomen-side end of the disposable pet diaper  38  in the fixed part of the leakproof sheet. The leakproof sheet stretchable elastic member  605  is overlapped with an abdomen-side waist stretchable elastic member  514  of the waist stretchable elastic member. Further, the abdomen-side waist stretchable elastic member  514  is overlapped with fastening parts  304 . 
     A comparison is made between the disposable pet diaper  10  of the first embodiment and the disposable pet diaper  38  of the 29th embodiment. In the disposable pet diaper  38  of the 29th embodiment, the erected section  700  including the abdomen-side erected section  710  and the crotch-side erected section  730 , part of the leg gathers  410 , the leakproof wall  820 , the leakproof gathers  840 , the third curved part  640  and part of the fourth curved part  420  are formed by the actions of the leg stretchable elastic member  408  and the leakproof sheet stretchable elastic member  605 . 
     The first abdomen-side curved part  541  is formed by the action of the waist stretchable elastic member or the abdomen-side waist stretchable elastic member  514 . 
     Two structures of the first contraction force intersecting regions  181  are formed. One is formed by intersection of the contraction forces of the leg stretchable elastic member  408  and the abdomen-side waist stretchable elastic member  514 , and the other is formed by the contraction force of the leakproof sheet stretchable elastic member  605  and the contraction force of the abdomen-side waist stretchable elastic member  514 . Accordingly, two structures of the second abdomen-side curved parts  184  are formed by formation of the two structures of the first contraction force intersecting regions  181 . 
     Specifically, unlike in the disposable pet diaper  10  of the first embodiment, the back-side erected section  720 , part of the leg gathers  410 , the first back-side curved part  542 , the second back-side curved part  185  and part of the fourth curved part  420  are not formed in the disposable pet diaper  38  of the 29th embodiment. 
     Therefore, the disposable pet diaper  38  of the 29th embodiment has all of the effects of the disposable pet diaper  10  of the first embodiment other than those exhibited by the back-side erected section  720 , the whole leg gathers  410 , the first back-side curved part  542 , the second back-side curved part  185  and the whole fourth curved part  420 . 
     In this structure, the contraction forces strongly act only on the abdomen-side region, so that a pocket can be readily formed in an abdomen-side region of the absorbent core. Therefore, this disposable pet diaper is suitable as a disposable diaper for male pets. 
     Furthermore, by provision of the abdomen-side waist stretchable elastic member  514  overlapped with the fastening parts  304 , when the abdomen-side waist area is set on the abdomen of the pet in order to put the disposable pet diaper  38  on the pet, the fastening parts  304  are curved inside the disposable pet diaper under the influence of the contraction force of the abdomen-side waist stretchable elastic member  514 . Thus, it is made easier for the user to grab the fastening parts  304 . 
     The structures or features of the disposable pet diaper according to this invention are not limited to those described above. The structures or features of the first to 29th embodiments can be appropriately used in combination. 
     Correspondences Between the Features of the Embodiments and the Features of the Invention 
     The disposable pet diaper  10 ,  11 ,  12 ,  13 ,  14 ,  15 ,  16 ,  17 ,  18 ,  19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  27 ,  28 ,  29 ,  30 ,  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  is an example embodiment that corresponds to the “disposable diaper for pets” according to this invention. The back-side waist area  130  is an example embodiment that corresponds to the “back-side waist area” according to this invention. The abdomen-side waist area  110  is an example embodiment that corresponds to the “abdomen-side waist area” according to this invention. The crotch area  120  is an example embodiment that corresponds to the “crotch area” according to this invention. The diaper longitudinal direction Y and the diaper transverse direction X are example embodiments that correspond to the “diaper longitudinal direction” and the “diaper transverse direction”, respectively, according to this invention. The end  130 A of the back-side waist area is an example embodiment that corresponds to the “back-side waist area end” according to this invention. The end  110 A of the abdomen-side waist area is an example embodiment that corresponds to the “abdomen-side waist area end” according to this invention. The ends  100 A in the diaper transverse direction are an example embodiment that corresponds to the “ends” according to this invention. The back-side flap  160 ,  161 ,  162 ,  163 ,  164  is an example embodiment that corresponds to the “back-side flap” according to this invention. The abdomen-side flap  150  is an example embodiment that corresponds to the “abdomen-side flap” according to this invention. The reference virtual straight line  100 Y 1  is an example embodiment that corresponds to the “reference virtual straight line” according to this invention. The tail insertion opening  190  is an example embodiment that corresponds to the “tail insertion opening” according to this invention. The absorbent core  200  is an example embodiment that corresponds to the “absorbent core” according to this invention. The fastening part  300 ,  301 ,  302 ,  303 ,  304  is an example embodiment that corresponds to the “fastening part” according to this invention. The fastening region  900 ,  901 ,  902 ,  903 ,  904 ,  905 ,  906 ,  907  is an example embodiment that corresponds to the “fastening region” according to this invention. The minimum width point  100 AP is an example embodiment that corresponds to the “diaper minimum width point” according to this invention. The flap boundary line  100 Y 1  is an example embodiment that corresponds to the “virtual boundary line” according to this invention. The body  140 B is an example embodiment that corresponds to the “body” according to this invention. The length  160 L is an example embodiment that corresponds to the “length of the back-side flap in the diaper transverse direction” according to this invention. The length  150 L is an example embodiment that corresponds to the “length of the abdomen-side flap in the diaper transverse direction” according to this invention. The end  160 B,  161 B,  162 B,  163 B of the back-side flap in the transverse direction is an example embodiment that corresponds to the “end of the back-side flap in the transverse direction” according to this invention. The maximum width region  160 B 1 ,  161 B 1 ,  162 B 1 ,  163 B 1  is an example embodiment that corresponds to the “maximum width region” according to this invention. 
     In view of the nature of the above-described invention, various features can be provided as follows. 
     (Aspect 1) 
     A disposable diaper for pets, comprising: 
     a back-side waist area, an abdomen-side waist area, and a crotch area between the back-side waist area and the abdomen-side waist area, 
     a diaper longitudinal direction in which the back-side waist area, the crotch area and the abdomen-side waist area contiguously extend when the disposable diaper is not worn by a pet, and a diaper transverse direction crossing the diaper longitudinal direction, 
     a back-side waist area end in the diaper longitudinal direction, an abdomen-side waist area end in the diaper longitudinal direction, and both ends in the diaper transverse direction, 
     a back-side flap, 
     an abdomen-side flap, 
     a tail insertion opening formed in a prescribed region in the diaper longitudinal direction, 
     an absorbent core formed on one side of the tail insertion opening in the diaper longitudinal direction and disposed in a prescribed region extending over the crotch area and the abdomen-side waist area, 
     a fastening part having a prescribed length and provided in the abdomen-side flap, and 
     a fastening region provided in the back-side waist area and configured to receive the fastening part, wherein: 
     when the disposable diaper is put on the pet, the crotch area and the abdomen-side waist area cover a crotch and an abdomen of the pet, while the back-side waist area is closely fitted to a back of the pet, and the fastening part is fastened to the fastening region, 
     while the disposable diaper is worn by the pet, the weight of the absorbent core after excretion is received in the longitudinal direction of the fastening part, and 
     a length of the back-side flap in the diaper transverse direction is different from a length of the abdomen-side flap in the diaper transverse direction. 
     (Aspect 2) 
     The disposable diaper as defined in aspect 1, comprising: 
     a pair of diaper minimum width points on the both ends in the diaper transverse direction between which a virtual straight line connecting the both ends in the diaper transverse direction is shortest, 
     a pair of virtual boundary lines extending in the diaper longitudinal direction and passing through the diaper minimum width points, 
     a body comprising an inside region between the pair virtual boundary lines, 
     a pair of the back-side flaps formed outside the pair virtual boundary lines in the back-side waist area, 
     an end of the back-side flap in the transverse direction, and 
     a pair of the abdomen-side flaps formed outside the pair virtual boundary lines in the abdomen-side waist area. 
     (Aspect 3) 
     The disposable diaper as defined in aspect 2, wherein the length of the back-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the back-side flap in the diaper transverse direction, and the length of the abdomen-side flap in the diaper transverse direction corresponds to a maximum distance between the virtual boundary line and the end of the abdomen-side flap in the diaper transverse direction. 
     (Aspect 4) 
     The disposable diaper as defined in aspects 1 to 3, wherein the length of the back-side flap in the diaper transverse direction is shorter than the length of the abdomen-side flap in the diaper transverse direction. 
     (Aspect 5) 
     The disposable diaper as defined in aspects 1 to 3, wherein the length of the back-side flap in the diaper transverse direction is longer than the length of the abdomen-side flap in the diaper transverse direction. 
     (Aspect 6) 
     The disposable diaper as defined in any one of aspects 1 to 5, wherein the back-side flap is configured such that a distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction varies in the diaper longitudinal direction. 
     (Aspect 7) 
     The disposable diaper as defined in aspect 6, wherein the end of the back-side flap in the transverse direction has a shape that gradually changes in the diaper longitudinal direction. 
     (Aspect 8) 
     The disposable diaper as defined in aspect 7, wherein the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve. 
     (Aspect 9) 
     The disposable diaper as defined in aspect 7, wherein the shape of the end of the back-side flap in the transverse direction is defined by a straight line. 
     (Aspect 10) 
     The disposable diaper as defined in aspect 6, wherein the end of the back-side flap in the transverse direction include a region which gradually changes in shape in the diaper longitudinal direction and a region which is parallel to the diaper longitudinal direction. 
     (Aspect 11) 
     The disposable diaper as defined in aspect 10, wherein the region of the end of the back-side flap in the transverse direction which gradually changes in shape in the diaper longitudinal direction is defined by a generally circular arc curve. 
     (Aspect 12) 
     The disposable diaper as defined in aspect 10, wherein the region of the end of the back-side flap in the transverse direction which gradually changes in shape in the diaper longitudinal direction is defined by a straight line. 
     (Aspect 13) 
     The disposable diaper as defined in any one of aspects 6 to 12, wherein an intermediate region of the back-side flap in the diaper longitudinal direction forms a maximum width region where the distance in the diaper transverse direction between the virtual boundary line and the end of the back-side flap in the transverse direction becomes maximum. 
     (Aspect 14) 
     The disposable diaper as defined in aspect 13, wherein the shape of the end of the back-side flap in the transverse direction is defined by a generally circular arc curve which defines the maximum width region having a maximum width. 
     (Aspect 15) 
     The disposable diaper as defined in aspect 13, wherein the shape of the end of the back-side flap in the transverse direction is defined by a straight line which defines the maximum width region having a maximum width. 
     (Aspect 16) 
     The disposable diaper as defined in any one of aspects 11 to 15, wherein the maximum width region intersects at a point with a virtual line extending in the diaper longitudinal direction. 
     (Aspect 17) 
     The disposable diaper as defined in any one of aspects 11 to 16, wherein the fastening region is provided on a virtual line extending in the diaper transverse direction and passing through the maximum width region of the back-side flap. 
     (Aspect 18) 
     The disposable diaper as defined in any one of aspects 6 to 17, wherein an end of the fastening region in the diaper transverse direction has a different shape from an end of the back-side flap in the diaper transverse direction. 
     (Aspect 19) 
     The disposable diaper as defined in aspect 18, wherein the end of the fastening region in the diaper transverse direction has a linear shape. 
     (Aspect 20) 
     The disposable diaper as defined in aspect 18, wherein the end of the fastening region in the diaper transverse direction has a shape that gradually changes in the diaper longitudinal direction. 
     (Aspect 21) 
     The disposable diaper as defined in aspect 20, wherein the end of the fastening region in the diaper transverse direction has a generally circular arc shape. 
     (Aspect 22) 
     The disposable diaper as defined in aspect 20, wherein the end of the fastening region in the diaper transverse direction has a linear shape. 
     DESCRIPTION OF THE NUMERALS 
     
         
           10 ,  11 ,  12 ,  13 ,  14 ,  15 ,  16 ,  17 ,  18 ,  19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  27 ,  28 ,  29 ,  30 ,  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38 ,  1000  disposable pet diaper 
           10 A,  11 A,  12 A,  13 A,  14 A,  15 A,  16 A identification region 
           10 A 1  first extended identification region 
           10 A 11  first virtual line 
           11 A 1  second extended identification region 
           12 A 1  colored identification region 
           13 A 1 ,  14 A 1 ,  15 A 1 ,  16 A 1  visible region 
           13 A 2  light transmissive identification region 
           14 A 2  cutout identification region 
           15 A 2  first open identification region 
           16 A 2  second open identification region 
           16 A 22  cover region 
           100 A end in the diaper transverse direction 
           100 AP diaper minimum width point 
           100 P diaper center point 
           100 Y 1  flap boundary line 
           100 Y 2  diaper longitudinal center line 
           100 Z 1  inside surface 
           100 Z 2  outside surface 
           110 ,  1110  abdomen-side waist area 
           110 A,  1110 A abdomen-side end 
           110 AP abdomen-side end center point 
           120 ,  1120  crotch area 
           120 A leg-side end 
           130 ,  1130  back-side waist area 
           130 A,  1130 A back-side end 
           130 AP back-side end center point 
           140 A flap 
           140 B body 
           150 ,  1150  abdomen-side flap 
           150 A end in the diaper longitudinal direction 
           150 A 1  fifth virtual line 
           150 B end in the diaper transverse direction 
           150 C,  1150 B back-side end 
           150 L length of the abdomen-side flap in the diaper transverse direction 
           160 ,  161 ,  162 ,  163 ,  164 ,  1160  back-side flap 
           160 B,  161 B,  162 B,  163 B end of the back-side flap in the transverse direction 
           160 B 1 ,  161 B 1 ,  162 B 1 ,  163 B 1  maximum width region 
           160 L length of the back-side flap in the diaper transverse direction 
           170  absorbent-core non-arrangement region 
           171  abdomen-side erected region 
           172  back-side erected region 
           173  crotch-side erected region 
           180  contraction force intersecting region 
           181  first contraction force intersecting region 
           182  second contraction force intersecting region 
           183  second curved part 
           184  second abdomen-side curved part 
           185  second back-side curved part 
           190 ,  1190  tail insertion opening 
           191  cut 
           200 ,  2000  absorbent core 
           210  abdomen-side end 
           220  back-side end 
           230  end in the diaper transverse direction 
           300 ,  301 ,  302 ,  303 ,  304 ,  3000  fastening part 
           300 C 1  fourth virtual line 
           310  free part 
           320  fixed part 
           300 P 1  fastening part midpoint 
           300 P 2  shortest line point 
           300 L shortest straight-line distance 
           300 X fastening part longitudinal direction 
           300 Y fastening part transverse direction 
           400 ,  401 ,  401 A,  401 B,  401 C,  402 ,  402 A,  402 B,  403 ,  404 ,  405 ,  406 ,  407 ,  408 ,  4000  leg stretchable elastic member 
           410 ,  4410  leg gather 
           420  fourth curved part 
           500  waist stretchable elastic member 
           510 ,  511 ,  512 ,  513 ,  514  abdomen-side waist stretchable elastic member 
           520  back-side waist stretchable elastic member 
           530  waist gather 
           540  first curved part 
           541  first abdomen-side curved part 
           542  first back-side curved part 
           600 ,  601 ,  602 ,  603 ,  604 ,  605 ,  6000  leakproof sheet stretchable elastic member 
           610  contraction force fixing part 
           620  abdomen-side contraction force fixing part 
           630  back-side contraction force fixing part 
           640  third curved part 
           700  erected section 
           710  abdomen-side erected section 
           720  back-side erected section 
           730  crotch-side erected section 
           740  erected sheet 
           800 ,  8000  leakproof sheet 
           810  folded part 
           820  leakproof wall 
           830  leakproof sheet fixed part 
           840  leakproof gather 
           850  excrement storage space 
           900 ,  901 ,  902 ,  903 ,  904 ,  905 ,  906 ,  907 ,  9000  fastening region 
           900 A,  901 A,  902 A,  903 A,  904 A,  905 A,  906 A,  907 A first fastening region 
           900 B,  901 B,  902 B second fastening region 
           900 BC 1  second virtual line 
           910  liquid-permeable sheet 
           920  liquid-resistant sheet 
           930  outer sheet 
           930 A,  931 A,  932 A,  933 A,  934 A first welded part 
           930 AA first welded part group 
           930 AB,  931 AB,  932 AB first adjacent welded part group 
           930 A 1 ,  931 A 1  first welded continuous line 
           932 A 2 ,  933 A 2 ,  934 A 2  first welded short line 
           930 B,  931 B,  932 B,  933 B,  934 B second welded part 
           930 BA second welded part group 
           930 BB,  931 BB,  932 BB second adjacent welded part group 
           930 B 1 ,  931 B 1  second welded continuous line 
           932 B 2 ,  933 B 2 ,  934 B 2  second welded short line 
           930 C,  931 C,  932 C,  933 C,  934 C third welded part 
           930 CA third welded part group 
           930 CB,  931 CB third adjacent welded part group 
           930 C  1  third welded continuous line 
           931 C 2 ,  932 C 2 ,  933 C 2 ,  934 C 2  third welded short line 
           930 D,  931 D,  932 D,  933 D,  934 D surrounding part 
           930 D 1 ,  930 D 2  first diagonal line 
           930 L 1 ,  931 L 1  first loop part 
           930 L 2 ,  931 L 2  second loop part 
           931 L 3  third loop part 
           931 L 4  fourth loop part 
           931 L 5  fifth loop part 
         D 1  diaper longitudinal length 
         D 2  measured length 
         D 150  sixth virtual line 
         D 160  third virtual line 
         F 1  contraction force of the leg stretchable elastic member 
         F 2  contraction force of the waist stretchable elastic member 
         F 3  contraction force acting on the contraction force intersecting region 
         X diaper transverse direction 
         Y diaper longitudinal direction 
         α pet 
         α 1  leg of pet 
         α 2  back of pet 
         α 3  abdomen of pet