To provide a disposable discarding bag for waste liquid, which can be easily used without staining hands, and at the same time, can be easily discarded, and in addition, can be easily manufactured.

By doubly folding a longitudinally long external bag 1, an upper bag part 3 of which the upper end is opened, and a lower bag part 5 which communicates with the upper bag part 3 by a folded back part, are formed, and in the upper bag part 3, an internal bag 8 where an absorber for waste liquid is placed, or the internal bag 8 made of a material which absorbs waste liquid is inserted to form this disposable discarding bag for waste liquid, and a user urinates in the internal bag 8, or pours in other waste liquid, and after immediately making the absorber 12 absorb or adsorb it, the upper end only of the external bag 1 is held, and by the weight of the waste liquid, a lower part of the external bag 1, i.e., the lower bag part 5 is stretched downward, and at the same time, the internal bag 8 is dropped in the stretched lower bag part 5, and the upper bag part 3 which becomes empty is properly tied, and the bag is discarded.