It is an object of the invention to provide an absorbent article that is resistant to twisting and flattening, and that is superior in terms of fluid absorption rate, fluid diffusibility, absorbed fluid retention volume and fluid retention. The absorbent article comprises a top sheet 31 on the skin contact side, a back sheet 32 on the non-skin contact side, and an absorbent body 30 situated between the two sheets, wherein the absorbent body 30 comprises a bulky absorbent sheet 19, and the bulky absorbent sheet 19 comprises heat-expanding particles that are dispersed in the bulky absorbent sheet and have been expanded by heat.
