Disposable pants-type diaper

1. A disposable diaper comprising:

a chassis having a longitudinal direction, a transverse direction, a side facing the wearer's skin and a side facing away from the wearer's skin and configurationally comprising a front waist region, a rear waist region, a crotch region extending between said front and rear waist regions, a waist-opening and a pair of leg-openings,

a liquid-absorbent structure provided on said side facing the wearer's skin of said chassis and extending across said crotch region further into said front and rear waist regions, said liquid-absorbent structure containing therein a liquid-absorbent core, and,

each of said front and rear waist regions comprising an upper elasticized region extending in the transverse direction along a periphery of said waist-opening,

a pair of lower elasticized regions spaced apart from each other in the transverse direction and disposed in opposite lateral regions of each waist region,

a non-elasticized region disposed between said pair of lower elasticized regions and opposed to a central zone of said liquid-absorbent structure, and

an intermediate elasticized region extending between the upper elasticized region and the lower elasticized regions and outside of longitudinally opposite ends of the liquid-absorbent structure,

wherein in at least in the front waist region of the front and rear waist regions a tensile stress of the intermediate elasticized region is lower than a tensile stress of the upper elasticized region.

2. The diaper according to claim 1 , wherein said intermediate elasticized region has a tensile stress lower than a tensile stress of said lower elasticized regions.

3. The diaper according to claim 1 , wherein a relationship of said tensile stress among the upper elasticized region, said intermediate elasticized region and said lower elasticized region can be represented by said upper elasticized region>the lower elasticized region>said intermediate elasticized region.

4. The diaper according to claim 1 , wherein said upper elasticized region exhibits a tensile stress in a range of about 1.0 to 3.0 N/25 mm at a state corresponding to about 80% of its maximum extended state, said lower elasticized region exhibits a tensile stress in a range of about 0.5 to 2.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state and said intermediate elasticized region exhibits a tensile stress in a range of about 0.3 to 1.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state.

5. The diaper according to claim 1 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

6. The diaper according to claim 2 , wherein a relationship of said tensile stress among the upper elasticized region, said intermediate elasticized region and said lower elasticized region can be represented by said upper elasticized region>the lower elasticized region>said intermediate elasticized region.

7. The diaper according to claim 2 , said upper elasticized region exhibits a tensile stress in a range of about 1.0 to 3.0 N/25 mm at a state corresponding to about 80% of its maximum extended state, said lower elasticized region exhibits a tensile stress in a range of about 0.5 to 2.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state and said intermediate elasticized region exhibits a tensile stress in a range of about 0.3 to 1.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state.

8. The diaper according to claim 3 , said upper elasticized region exhibits a tensile stress in a range of about 1.0 to 3.0 N/25 mm at a state corresponding to about 80% of its maximum extended state, said lower elasticized region exhibits a tensile stress in a range of about 0.5 to 2.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state and said intermediate elasticized region exhibits a tensile stress in a range of about 0.3 to 1.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state.

9. The diaper according to claim 6 , said upper elasticized region exhibits a tensile stress in a range of about 1.0 to 3.0 N/25 mm at a state corresponding to about 80% of its maximum extended state, said lower elasticized region exhibits a tensile stress in a range of about 0.5 to 2.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state and said intermediate elasticized region exhibits a tensile stress in a range of about 0.3 to 1.0 N/25 mm at a state corresponding to about 80% of its maximum stretched state.

10. The diaper according to claim 2 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

11. The diaper according to claim 3 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

12. The diaper according to claim 4 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

13. The diaper according to claim 6 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

14. The diaper according to claim 7 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

15. The diaper according to claim 8 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.

16. The diaper according to claim 9 , wherein tape fasteners for disposal of used diaper are attached to said intermediate elasticized region.