A disposable diaper (10) has elastic leg sections (75), which expand and contract in a product longitudinal direction, disposed further to the inside in a product width direction than a pair of leg opening sections. The area between a rear leg opening section (35R) and a straight line that passes through the center in the product width direction parallel to the product longitudinal direction, is larger than the area between a front leg opening section (35F) and the straight line, which extends in the product longitudinal direction through the center in the product width direction. Elastic buttock sections (77), which straddle a crotch region and a front waist region and expand and contract in the product longitudinal direction, are disposed further to the outside in the product width direction than the elastic leg sections (75). The front end sections of the elastic buttock sections are disposed further to the rear than the center of the leg opening sections in the product longitudinal direction.
