A disposable diaper 1 has a central elastic member 44 formed along the lengthwise direction L so that the absorber 40 can be curved to be convex in the inward direction and a pair of side slits 42S formed along the lengthwise direction L so that the absorber 40 can be curved to be convex in the outward direction. A thickness of the absorber at the central portion 40C and at the side edge portions 40S are smaller than a thickness of the absorber at the middle portions 40M.
