PROBLEM TO BE SOLVED: To provide a disposable diaper being deformable by following movement of the legs of a wearer and suppressing displacement of a waist opening part.SOLUTION: A back waist area S2 of the disposable diaper includes, in a state of being joined at side joining parts 30, a first area R1, a second area R2, and a third area R3 partitioned in a product longitudinal direction L. The first area is located at a product-longitudinal outer end part of the back waist area. The second area is located at a product-longitudinal inner end part of the back waist area. The third area is located between the first area and the second area. A product-width-directional stretching ratio of the first area and a product-width-directional stretching ratio of the second area are higher than a product-width-directional stretching ratio of the third area. The product-width-directional stretching ratio of the first area and the product-width-directional stretching ratio of the third area are higher than the product-width-directional stretching ratio of the second area. A product-longitudinal stretching ratio of the third area is higher than a product-longitudinal stretching ratio of the first area and a product-longitudinal stretching ratio of the second area.
