Provided is a disposable diaper, which can be placed so as to conform to the wearers body and with which fit and feel when worn can be improved. The disposable diaper (10) is provided with a top sheet (50) disposed more on the skin-contacting surface side than an absorbent (40), and an auxiliary sheet (55) disposed between the top sheet (50) and the absorbent (40). First notches (115) and second notches (125) are formed in the absorbent (40) as pairs of curve-changing areas that extend in the width direction (W) of the product. The density of the auxiliary sheet (55) is lower than the density of a covering sheet (40b) configuring the absorbent (40). The outer ends (55A) of the auxiliary sheet (55) in the longitudinal direction (L) of the product are located to the outside of at least one of the paired curve-changing areas (115, 125) in the longitudinal direction (L) of the product. The outer ends (75A) of the leg elastic sections (75) in the longitudinal direction (L) of the product are located to the outside of the first notches (115) and the second notches (125) in the longitudinal direction (L) of the product.
