The disposable diaper according to the present invention includes a base sheet (12) made of nonwoven fabric and a hook sheet (110) provided with a plurality of engagement hooks. A KES bending stiffness value in a fastening tape existent region (SHS) is equal to or less than 1.64 gf·cm2/cm, the height of the engagement hook is between 60 and 200 μm; and the color difference (ΔE) between the hook sheet existent region (SHS) on the inner side of a fastening tape (100) and side flaps (50) adjacent to the fastening tape (100) is 6.5 or more, when the color difference of L* is ΔL*, the color difference of a* is Δa*, and the color difference of b* is Δb* according to the L*a*b* color coordinate system.