[Problem]To provide a disposable paper diaper, which has fastening sheets on the two side portions of a back side and which can cope at will with not only the ordinary fastening method but also a cross fastening method.[Means for Solving the Problem]A disposable paper diaper comprising fastening sheets 5 and 5 individually formed on the two side portions of the back side of the paper diaper and each including: joint ears 8a and 8a formed to extend from the outer side edges of one sheet and to protrude sideward at two upper and lower stages and facing fasteners 9 disposed on the inner sides of said joint ears 8a and 8a, whereby the disposable paper diaper is worn on a body by fixing said joint ears 8a and 8a on the surface of the abdomen side of the paper diaper. Perforations 10 leading from the outer side edge to the inner side are formed in the portion of a fastening base sheet 8 between said joint ears 8a and 8a. In said perforations 10, a first perforation section 10a from the outer side edge to an intermediate point P is a high tearing strength section So having a relatively coarse perforation interval, and a second perforation section 10b from said intermediate point P to the inner end is a low tearing strength section SI having a relatively fine perforation interval.
