PURPOSE: To perform the divestiture operation of shorts for underwear extremely easily and besides quickly by making at least one place of sewing thread or rubber thread at a waist part or a leg part discontinuous, in undershorts consisting of synthetic resin unwoven fabric where the METSUKE (weight/unit area) and the tearing strength are specified.

CONSTITUTION: This undershorts consist of synthetic fiber unwoven fabric where METSUKE is 20-70g/m2 and the tearing strength is 0.30-2.0kg, and at least one place of the sewing thread or rubber thread in a waist part or a leg part is discontinuous, and a starting point of tearing of a perforation or a V-shaped notch is formed at the discontinuous part. Hereby, this can be divested quickly with simple operation. For this undershorts, a urine adsorbing sheet 10 is mounted near the inside of the crotch of the shorts body. Moreover, for the right and left cover members of the front and rear under parts 2a and 2b, unwoven fabric which shows anisotropy in longitudinal and lateral directions as to tearing strength is used, and usual cutting and sewing are made.