Abstract: A brief-type diaper that is capable of preventing deformation caused by squeezing of the liquid absorber and capable of preventing leakage around leg openings. The pant-type diaper comprises of a first elastic member arranged adjacent to free ends provided at the periphery of leg openings of the diaper, in which a lengthwise liquid absorber is longitudinally joined inside of the crotch of the brief-type diaper so that transverse pulling power from a second elastic member or elastic belt-like pieces arranged at the exterior sheet is applied to both sides of the liquid absorber extended from the front portion to the back portion.