A pull-on diaper adapted to fit the body type peculiar to the younger baby and being unlikely to leave a mark on the skin of the younger baby. A pull-on diaper (10) for younger baby has a transverse direction (X) and a longitudinal direction (Y) being orthogonal to each other, and includes a front waist region (18), a rear waist region (19), a crotch region (13) connected to the front and rear waist regions and leg cuffs (40) extending along respective laterals of the crotch region (13). Each of front and rear waist panels is sectionalized into a first elastically contractible region (26) and a second elastically contractible region (27) wherein a dimensional ratio in the longitudinal direction between the first elastically contractible region and the second elastically contractible region is in a range of 1 : 1.6 to 1 : 2.2 and an elongation ratio of waist elastics (30) attached to the first elastically contractible region is lower than an elongation ratio of the waist elastics (30) attached to the second elastically contractible region and the elongation ratio of the waist elastics attached to the second elastically contractible region is lower than an elongation ratio of second leg elastics (42).
