A disposable undergarment 1 has a liquid-absorbent panel 4, and the panel includes a body fluid absorbing/holding layer 4a formed with a plurality of depressions 7 each extending in the thickness direction thereof and a nonwoven fabric layer 4b placed upon upper surface of the absorbing/holding layer 4a. Heat-sealable fibers contained in the absorbing/holding layer 4a are heat-sealed with the nonwoven fabric layer 4b over contacting surfaces of these absorbing/holding layer 4a and the nonwoven fabric layer 4b. Furthermore, the nonwoven fabric layer 4b is partially engaged in the depressions 7 of the absorbing/holding layer 4a so that the heat-sealable synthetic fibers contained in the absorbing/holding layer 4a are heat-sealed with the nonwoven fabric layer 4b also over contacting surfaces of these two layers 4a, 4b in the respective depressions 7.
