[Problem]An underpants type disposable diaper cover capable of firmly holding an absorbent pad.[Means for Solving Problems]In an underpants type disposable diaper cover comprising a front body part (F) and a back body part (B) which are formed in such a manner as to be continuous with each other at a crotch portion and both side portions, thereby creating a waist opening (23) and a pair of right and left leg openings, and an absorbent pad (10) which is detachably attached to an inner surface thereof, a plurality of waist portion-elastic members (24) are spaced, reaching from one side to the other side, in a longitudinal direction along the waist opening (23) in the front and back body parts (F, B), a plurality of curved elastic members (26, 28) are spaced without intersecting each other in each of the front and back body parts (F, B), which extend from an upper level with respect to a middle level in a longitudinal direction on one side in a lateral direction, to an upper level with respect to a middle level in the longitudinal direction on the other side in the lateral direction, and extend so as to be curved toward the crotch portion with increasing closeness to a central portion in the lateral direction and a curved portion of at least one of the curved elastic members (28) is configured in the front body part (F) as to pass on both sides with respect to an upper end portion of the attached absorbent pad.
