Provided is a disposable clothing article that is an improvement of prior inventions and is capable of size adjustment using relatively easy maneuvers and of fitting to the wearers body in such a way that the liquid absorption capability of the entire absorbent core is fully manifested. A folding guide (28) extending in the transverse axial direction Q is formed in the front waist region (11) of an absorbent core (26). A fastening system that mutually connects the two side edges of the front and back waist regions (11, 12) of the diaper (10) comprises: a first fastening system configured from first fastening elements (18a, 18b) provided on the skin side of a pair of tape fasteners (16, 17), which extend outward from the two side edges (12a) of the back waist region (12) in the transverse axial direction Q, and a second fastening element (21) disposed on the non-skin side of the waist region (11) above the folding guide (28) and a second fastening system configured from the pair of first fastening elements (16, 17) and a third fastening element (22) disposed on the non-skin side of the front waist region (11) below the folding guide (28).
